Europe take a 5-3 lead into the second day of the Ryder Cup after Colin Montgomerie holed the last putt of the day to earn a half with Lee Westwood.
Montgomerie and Westwood size up a putt on their way to a half point
Luke Donald and Sergio Garcia earned a two-hole win over Tiger Woods and Jim Furyk in the fourballs.
Irish duo Padraig Harrington and Paul McGinley had to settle for a half against Chad Campbell and Zach Johnson.
And David Howell and Sweden's Henrik Stenson were reined in by Stewart Cink and David Toms and ended all square.
DAY ONE AS IT HAPPENED (all times BST):
By Alex Trickett & Phil Harlow
MATCH HALVED: Colin Montgomerie holes an eight-foot putt with aplomb to earn a half for his team and give Europe a two-point cushion.
1838: The last match of the day reaches the final green. The outcome of this match will have a major impact on the mood going into Saturday.
MATCH HALVED: David Toms is left staring in disbelief as a brilliantly judged putt from at least 20 yards lips out. Equally unbelievably, David Howell's putt to win the match does almost exactly the same thing.
The match ends as an honourable draw, with Henrik Stenson impressing on his Ryder Cup debut.
1823: Phil Mickelson ensures the US side will take at least half a point from his and Chris DiMarco's hard-fought match against Lee Westwood and Colin Montgomerie as they take a 1 up lead into the last hole.
EUROPE WIN: A long putt from Jim Furyk misses narrowly and that's enough to give Europe's Luke Donald and Sergio Garcia the hole and a richly deserved 2 up win.
1818: The rain is belting down now, which is all the players need.
1812: The pressure is telling, make no mistake. Chris DiMarco plays a tee shot so wide it may end up in the car park. And in another foursome, Jim Furyk loses his bearings badly and fires the ball into the water.
MATCH HALVED: Zach Johnson holds his nerve admirably as he holes a missable putt on the final green to secure half a point for his side. Padraig Harrington will be kicking himself for his late error.
1807: Padraig Harrington scratches his head in bemusement after overshooting the green and finding water at the last. Could all his and Paul McGinley's hard work be about to be undone?
1805: Colin Montgomerie's mistake is followed up by a sensible putt from Phil Mickelson. Europe concede the hole and the US take a 1 up lead with two holes to play.
1802: Another magnificent approach shot - and running commentary - from Sergio Garcia gives Luke Donald the chance to make an easy putt at the 17th. It gives Europe a 1 up lead going into the last, and the guarantee of a half at the very worst.
1758: Colin Montgomerie finds the River Liffey at the 16th for the second time of the day. His reaction is that of a man who knows he may have just cost his team a priceless Ryder Cup point. Just to rub it in, Chris DiMarco plays a brilliant shot off the tee. It's definitely advantage team USA.
1755: David Howell shows great nerve to send the ball into the hole at the 16th and keep his match at all square.
1750: Fair play to Zach Johnson. The US rookie, who has not enjoyed the best of days on the greens, makes a great putt to pile the pressure onto Paul McGinley. But the Irishman comes up with the perfect answer as he fires in an equally impressive putt to take the match to the last hole with Europe 1 up.
1748: Jim Furyk is arguably the star of the opening day. He nails another difficult putt to ensure the match stays all square, meaning Europe are unable to capitalise on Sergio Garcia's breathtaking shot to the green.
1743: Nobody is giving an inch as the matches approach their climax. Phil Mickelson holes a putt to clinch a half at the 15th and keep the match in the balance.
1741: Sergio Garcia is rising to the occasion as the pressure builds at the K Club. The Spaniard puts the ball to within a couple of feet at the 16th and laps up the applause of the crowd, looking to the manor born.
1735: Another match goes to all square as US pairing Stewart Cink and David Toms claim a hole back from David Howell and Henrik Stenson. The next few minutes will be pivotal to the whole outcome of the match.
1733: Paul McGinley tries to bite a big chunk out of his arm after going desperately close from long range. His miss gives Zach Johnson and Chad Campbell two putts to win the hole and Johnson knocks in the second to bring the score back to Europe leading 1 up.
1727: Plugged in at the bunker, Colin Montgomerie can only just get the ball out and the Europeans go on to lose the hole and bring the match back to all square.
1724: Tiger Woods makes a par putt at the 15th to keep the match against Sergio Garcia and Luke Donald all square.
1716: Padraig Harrington can barely believe his luck as he is given the chance to put Europe further ahead after Campbell misses again. The Irishman makes no mistake and Europe go 2 up with three to play.
1714: The putting in the Padraig Harrington/Paul McGinley and Chad Campbell/Zach Johnson match is atrocious. A woeful attempt from Johnson somehow manages to make McGinley's earlier effort look good.
1708: Luke Donald misses a close-range putt under pressure after Tiger Woods and Sergio Garcia both set up birdie chances with their respective approach shots. Jim Furyk rolls his putt in though, and the US pair are all square again.
1702: Jim Furyk sends in one of the best putts of the day, curling it in from eight feet to birdie the 13th hole. Luke Donald has a tricky putt from the edge of the green and leaves it agonisingly short to allow the US to cut the gap back to 1 up.
1658: Another chance goes begging for the US pair of Chad Campbell and Zach Johnson as Campbell's putt to win the 14th goes astray.
1650: Sergio Garcia's excellent tee shot is finished off by Luke Donald at the 12th to put Europe 2 up over Tiger Woods and Jim Furyk.
1648: A bad miss from Zach Johnson costs his side a shot as Europe manage to halve the hole. "My bad" he says to partner Chad Campbell as they walk off the green, which is American for "sorry, my fault".
"Zach Johnson's putting has been awful today."
BBC golf commentator Iain Carter
1646: Sergio Garcia must have some well-behaved dogs at home if his ability to make his golf ball do what he wants is anything to go by. The Spaniard plays a shot off the tee at the 12th and never stops talking to the ball during its flight.
The ball ends up four feet from the flag to set up a birdie opportunity for Luke Donald.
1644: Colin Montgomerie is left rueing a slightly cautious approach as his putt at the 10th finishes an inch short, keeping the match at all square.
1640: It's give and take though, as Jim Furyk goes close enough with his first putt to be given the hole after a Sergio Garcia mistake created the opportunity. Europe still hold a 1 up lead though.
1638: Padraig Harrington slots his putt straight into the middle of the hole to double Europe's advantage to 2 up. All of a sudden, the scoreboard is looking a lot more healthy from a European perspective.
1636: David Howell makes no mistake with a close range putt to break the deadlock in the match against Stewart Cink and David Toms, with Europe into a 1 up lead after 10 holes.
"The players and the captains don't receive money for being here. Each team gets to nominate a charity for which some of the Ryder Cup profits go to."
BBC golf commentator Maureen Madill.
"It's tough for the caddies, there's no real financial incentive for them."
BBC golf commentator Graeme McDowell
1628: Tiger Woods' five-foot putt lips out at the 10th in a potentially pivotal moment in the match against Luke Donald and Sergio Garcia. The world number one's narrow miss hands a 2 up lead to Europe with eight holes to play.
1624: Paul McGinley and Padraig Harrington go back in front after Chad Campbell is narrowly wide with a lengthy putt. Europe are back into a 1 up lead.
1620: It's nip and tuck all over the course with a grand total of just one hole separating all four matches.
1609: Colin Montgomerie pulls a brilliant putt out of the bag to bring his and Lee Westwood's match back to all square. He owed Europe after his shocker at the previous hole, and the Scot can consider his slate wiped clean.
1605: A classload of teenage American schoolgirls appear to have made it into the K Club as a straightforward putt from Stewart Cink is greeted with the squeals of delight more often found at a Justin Timberlake concert. This is followed by the ever-endearing chants of "U-S-A, U-S-A".
1558: Europe are made to pay for Colin Montgomerie's horrible earlier shot as the US pair of Chris DiMarco and Phil Mickelson punish them by going 1 up.
1557: Sergio Garcia is turning into Europe's main man on the opening day as his occasionally fragile putting holds up superbly under pressure to save a half at the 8th.
1549: Colin Montgomerie looks thoroughly disgusted with himself as, in attempting to lay up at the 6th, he overhits the ball and sends it a) into a thicket of long grass and b) perilously close to the water.
Not what the Ryder Cup specialist was planning. He may well find himself having to buy Lee Westwood a drink tonight to make it up to him.
"That's a shocking play."
BBC golf commentator Mark Carnevale on Monty's rush of blood
1546: Europe's Luke Donald and Sergio Garcia stay 1 up, but they will be feeling like they should be further ahead as Donald underhits a putt to win the hole.
1540: Chris DiMarco holes his putt at the fifth to bring the match against Lee Westwood and Colin Montgomerie back to all square.
1532: Tiger Woods shows his touch around the greens is as sure as ever as an exquisite chip at the sixth rolls to within four inches of the hole and puts the pressure on Luke Donald. The putt from Donald goes wide and the US pair cut the gap to leave Europe 1 up.
1529: The momentum is definitely with Europe as the US pair of Zach Johnson and Chad Campbell celebrate a halved hole at the seventh.
1517: It's fast and furious in the foursomes and Europe are in the driving seat. Luke Donald has shrugged off the disappointment of being left out of the fourballs and proves it by rolling in a long, breaking putt to double the advantage in his match to 2 up.
1515: All of Ireland celebrates as the Padraig Harrington and Paul McGinley partnership edge 1 up in the opening foursome.
1509: Welcome Luke Donald to the Ryder Cup. The young Englishman drills a putts to restore his and Sergio Garcia's 1 up advantage over world number one Tiger Woods and Jim Furyk.
1504: A brief rain shower has just brushed past the K Club, but all is well for now and the exciting golf can continue.
1457: Bad news for Europe. Colin Montgomerie misses a testing eight footer to allow the pairing of Phil Mickelson and Chris DiMarco to go 1 up. Stewart Cink and David Toms also go 1 up in their match.
1451: Europe's Luke Donald and Sergio Garcia generously hand back the advantage to the US. A mistake from Donald - who has not started well - leaves the pair with too much to do and Tiger Woods and Jim Furyk are all square.
1446: Colin Montgomerie is back in the fray in the final match of the foursomes and he hits a lovely driver off the tee to the delight of the crowd. In the third match, David Howell and Henrik Stenson and Stewart Cink and David Toms are all square after the first.
1440: It's back to basics for Woods and Furyk on the second after the errors at the opener, and the US pair are content to halve the hole and get back on track.
1432: Jim Furyk goes close with a putt from eight feet at the first, but it's not close enough and Luke Donald and Sergio Garcia go 1 up despite their poor start to the hole.
1429: Padraig Harrington rolls in a delicate putt at the third hole to bring the match against Chad Campbell and Zach Johnson all square.
1422: Tiger Woods bites off a bit more than he can chew with embarrassing results at the first. With Furyk's tee shot in deep rough next to a tree, the world number one plays a shot left-handed with the club back to front.
But the ball moves approximately two feet towards the fairway, leaving Woods looking accusingly at his club and the tree. It's fair to say that Woods will not take good memories of the first hole away from Ireland.
1416: The umbrellas are up all over the course as the rain starts to fall at the K Club.
Luke Donald comes into the action, but sends his opening tee shot horribly wide of the fairway - not an auspicious start for the world number nine. He certainly hasn't done Sergio Garcia any favours with that shot.
EUROPE WIN: Emotional scenes at the 18th and Darren Clarke looks choked up with the crucial win, his putt helped secure. He and Lee Westwood grab a big point from the second of America's flagship pairings - Phil Mickelson and Chris DiMarco.
1400: Most of the excitement is on the 18th hole, but back on the 1st, the opening foursome is under way. Padraig Harrington must have rushed down his lunch double quick time because he is back out with Irish compatriot Paul McGinley against Americans Chad Campbell and Zach Johnson, who go 1 up.
1350: And then there were four... The last quartet is on the 18th hole. For now, there is no sign of the bad weather.
MATCH HALVED: Stewart Cink pitches close to the hole to apply pressure, but Europe have two putts to win the match. Robert Karlsson misses and then Paul Casey steps up. His putt is firm enough but a foot wide and the hole and match end all square. That's probably a fitting result after a high-quality affair, dominated by Europe on the outward nine and America on the back nine.
1341: There have been nearly as many splashes at the K Club as you'd expect to find at a water park. Phil Mickelson is the latest to dunk his ball - this time at the 17th hole.
1338: Robert Karlsson finds the middle of the 18th green, taking some pressure off Paul Casey, who clips his ball just inside his playing partner. Neither American finds the green so Europe are in pole position.
1330: As the scheduled start time for the afternoon foursomes passes, Robert Karlsson, Paul Casey, Stewart Cink and JJ Henry walk to the 18th all square. Hold on to your hats, this could be an exciting finish.
EUROPE WIN: Sergio Garcia lags his putt and it is enough to provide Europe with an immediate answer as he and Jose Maria Olazabal win their match 3&2.
USA WIN: Colin Montgomerie has a good run at the hole with his putt, but the ball drifts past. It's been the story of his day and is the main reason why Jim Furyk and Tiger Woods win the opening point by 1 hole.
1312: The death knell is sounding for Colin Montgomerie and Padraig Harrington at 18. Jim Furyk - as has been the case for much of the day - has the best placed ball on the green at a hole Europe must win for a half.
1308: A monster birdie putt by Paul Casey stops the rot for Europe in his match. It's all square with three to play.
1300: Music to Europe's ears, Spanish style. Sergio Garcia, arguably the best player of the morning, sinks another putt to put him and Jose Maria Olazabal 3 up with three to play.
1255: It's crunch time in the top match. Jim Furyk and Tiger Woods see their birdie putts wander wide and so does Colin Montgomerie's. So it's up to Padraig Harrington. He addresses the ball with confidence, takes a few practice swings and strikes the ball... But he pulls it wide. A chance spurned.
AFTERNOON PAIRINGS: The foursome line-ups are announced, with Irish duo Padraig Harrington and Paul McGinley due out first for Europe. The final match sees Luke Donald and Sergio Garcia take on Tiger Woods and Jim Furyk.
Friday's foursomes (All times BST, subject to change)
1330 Padraig Harrington/Paul McGinley (EUR) v Chad Campbell/Zach Johnson (USA)
1345 David Howell/Henrik Stenson (EUR) v Stewart Cink/David Toms (USA)
1400 Lee Westwood/Colin Montgomerie (EUR) v Phil Mickelson/Chris DiMarco (USA)
1415 Luke Donald/Sergio Garcia (EUR) v Tiger Woods/Jim Furyk(USA)
1250: Rain is imminent, we are being told, but those on the course will be keen to close out their matches before it arrives. It's slim advantage to Europe on 17 as Colin Montgomerie and Padraig Harrington do better than Tiger Woods and Jim Furyk at the quartet's impromptu "nearest the pin" challenge. But can anyone hole a birdie putt?
1241: Colin Montgomerie gets away with one when his drive at the 17th claws its way over the water hazard. But Paul Casey and Robert Karlsson are less fortunate on the 15th. They fall victim to the fourth birdie in five holes by America's most electric pairing on the back nine JJ Henry and Stewart Cink, who are 1 up.
1238: The top players in the world are playing top golf to the delight of a still sun-bathed K Club crowd. Back on 13, Chris DiMarco and Darren Clarke trade superb birdies.
1236: Drama at the 16th. Padraig Harrington lags his eagle putt close to the hole and the putt is reluctantly conceded by team USA. Europe are suddenly only 1 down in the top match.
1230: And on the 13th, Jose Maria Olazabal and Sergio Garcia double their lead to 2 up. The Ryder Cup pendulum has swung again, this time in Europe's favour.
1229: A harsh blow for Jim Furyk. He lands his approach to the 16th within 10 feet of the pin, but it spins back alarmingly off the green and into the water. That's the cue for Tiger Woods to weave some magic... But he can't and his ball lands up against the grandstand. This is a real chance for Europe.
"We've just had an alert for a severe weather warning for this area in the afternoon."
BBC Five Live presenter John Inverdale.
1224: At two down with three to play, Colin Montgomerie goes for broke. And he winds up in the water adjacent to the 16th green. Under pressure, Padraig Harrington responds by drilling his second shot on to the green for an eagle chance.
1221: An improbable comeback is complete in match two. Europe led by three holes, but Stuart Cink's birdie on 14 puts he and rookie JJ Henry all square with Robert Karlsson and Paul Casey.
1215: Is trouble looming for Europe? Lee Westwood and Darren Clarke find sand on the 12th. But Clarke gets up and down to half the hole.
1205: The morning's play is bubbling up towards an exciting conclusion with all to play for in every match. Chris DiMarco keeps America's momentum going with a gutsy putt on the 11th. The match is all square.
1158: Team Spain stay 1 up at the 11th thanks to a big putt from Sergio Garcia. He and Jose Maria Olazabal are being put under increasing pressure by David Toms, who is on a roll.
"Tiger's very much in his own world. I've met him a few times and he's a very nice guy but when he steps on the course he puts on a mask. I'm not a nervous person but when I played with him at a pro-am, I peed my pants."
German tennis star Boris Becker
1152: And finally... a birdie drops for Europe's lead-off pair. Colin Montgomerie is the man who gets it on hole 14, but the Americans Tiger Woods and Jim Furyk are still 2 up.
1148: Lee Westwood sinks a big putt to end a long stalemate in the final fourballs match of the opening morning. He and Darren Clarke are 1 up. But JJ Henry is on fire. Another birdie and another shot pulled back in match 2. Europe are still 1 up.
1137: A bad spell for Europe. The Spanish duo of Jose Maria Olazabal and Sergio Garcia lose the 10th hole to David Toms and Brett Wetterich, but are still 1 up. JJ Henry's birdie pegs back Paul Casey and Robert Karlsson's lead to 2 up.
1121: There is a Tiger on the prowl at K Club and that's worrying news for Europe. Woods draws the applause of Michael Jordan and a huge gallery at the 12th when he drains his second straight birdie putt. He and Jim Furyk are 3 up in the top match.
1116: Who says Americans don't care about the Ryder Cup? Michael Jordan - perhaps the greatest US sportsman of all time (as well as a keen golfer) - is at the K Club to spy on the swing of one of the other greats, Tiger Woods.
"You can't expect Woods to keep missing putts. Europe need to get one back because they are running out of holes."
BBC golf commentator Bernard Gallacher.
1112: Just as team USA land a blow, Europe hit back thanks to Jose Maria Olazabal's cool putt at the 9th. He and Sergio Garcia are now 2 up.
1108: Tiger Woods holes one on 11 and punches the air in familiar style. He and Jim Furyk are now 2 up against Colin Montgomerie and Padraig Harrington, neither of whom have made enough birdies.
1055: Another one lips out for Sergio Garcia and Jose Maria Olazabal also misses at the 8th as a chance goes begging for Europe. But Robert Karlsson's brilliant approach puts him and Paul Casey 3 up in the second match.
"The K Club is definitely favouring the longer hitters so far."
BBC golf commentator Maureen Madill.
1047: Tiger Woods hacks out of yet more rough and his ball limps tamely on to the 10th green. Strangely, he looks more like a village golfer today than one of the top two golfers of all time.
1044: Sergio Garcia misses a 12 footer by millimetres at the 7th. The Spaniard is playing really well and might have birdied every hole so far. His partnership with veteran compatriot Jose Maria Olazabal looks good and the pair can often be seen deep in conversation.
1034: But Europe hit back at the 7th, where the Americans have had a nightmare. Robert Karlsson escapes from the gantry to par the hole and that's enough to put him and Paul Casey 2 up.
1030: That man Jim Furyk strikes again. He carries Tiger Woods to 1 up against Colin Montgomerie and Padraig Harrington.
1024: A fantastic pitch and run from Lee Westwood almost drops into the 6th hole. It comes to rest about half an inch wide, but may well be conceded!
"Europe have made a dog's breakfast of the 7th hole."
BBC golf commentator Alistair Bruce-Ball after Karlsson lands on the gantry and Casey finds water
1018: Sensational scenes at the 7th, where Robert Karlsson lands his ball on an elevated television gantry at the foot of a camera man. We don't think he'll have to play the ball from there!
1016: Tiger Woods finally holes one to send the top match level again. Moments later, Sergio Garcia sinks a long putt to save his 3rd hole..
"Ireland has just opened its arms to both sides and that's truly wonderful. It's great for Ireland and great for the game of golf."
Former President George Bush Senior speaking on Five Live.
1004: Tiger Woods' day gets worse when he misses another clutch putt - the type he almost always sinks in tournament golf. Colin Montgomerie holes out to put Europe 1 up in the top match.
0958: The quality of the golf has largely been very high, but not so at the moment in the first group. Tiger Woods plays another horror shot and then Padraig Harrington and Jim Furyk join the "water club" at the 7th. Only Colin Montgomerie will have the pleasure of seeing his ball in good shape when he strolls up to the green.
"The crowd get their first truly throaty Irish roar as Harrington halves the hole."
BBC golf commentator Iain Carter.
0946: The opening group, which includes Tiger Woods, has been warned for slow play. This is quite unusual in matchplay golf, but the quartet will be spared the indignity of an official appearing with a timer for at least one more hole.
0942: Tiger Woods and Jim Furyk miss putts to win the 6th hole, so the pressure is on Padraig Harrington, who has an eight footer for a half. He rolls it in almost at the same time that Paul Casey holes a saving putt at the 5th.
0936: Colin Montgomerie is the second player of the day to rinse his ball in the K-Club water. His ball rolls agonisingly off the 6th green and plops into the hazard.
0927: Tiger Woods update: He won't like it one bit, but the world number one has been playing second fiddle to playing partner Jim Furyk in the opening holes. Woods misses a pressure putt at the 5th hole to allow Europe to go all square in the opening match.
0922: Paul Casey sinks the putt to go 1 up and Europe now lead in three of the four matches.
0914: Fireworks from Paul Casey, who sizzles his long approach to the par-five 4th to within 10 feet of the hole. He'll have that putt for an eagle.
0908: Europe are on a roll. After a slow start, they lead in two matches thanks to Clarke's 1 up birdie and trail only in the top match, featuring Tiger Woods and Colin Montgomerie. It hardly seems possible after a deafening start, but the atmosphere continues to build. We are in for three fabulous days of golf.
"A dream start for Darren. He's been thinking about the first hole for a long time."
Graeme McDowell, BBC Five Live summariser
0850: What hurricane? Talk of gales and rain is proving unfounded. The sun is beating down on the K Club, setting a brilliant stage for the early sparring as a long putt from Sergio Garcia gives Europe a 1 up lead in the third match. JJ Henry spoils the moment from a European point of view, holing out at the 2nd to give the USA a 1 up lead in match two.
0840: The biggest cheer of the day is reserved for Darren Clarke who leads the fourth and final fourballs pairing to the 1st tee. The Irishman lost his wife a few weeks ago and looks moved by the ovation. But he also looks very focused and rips a cracking drive down the middle of the fairway.
0830: Match three gets under way with the all Spanish pairing of Sergio Garcia and Jose Maria Olazabal up against David Toms and little-known US rookie Brett Wetterich.
0820: Jim Furyk wins the USA the 1st hole with a nerveless putt to go 1 up. He has wasted no time in showing why he is in the world's top three.
0816: JJ Henry smokes his opening drive down the fairway to get the second match started. Advantage America in this grouping as Europeans Paul Casey and Robert Karlssson miss the target area.
0807: Tiger Woods drops the ball as a large crowd parts to allow him a narrow channel through which to play it. His third shot pitches just off the green. He is in decent shape, but Padraig Harrington and Colin Montgomerie find the green with their second shots. Under pressure, Jim Furyk lands closest to the pin and will have 10-foot putt for birdie. That was ice cool from the American.
0800: It's time. The first four players stride up to the 1st tee and Jim Furyk has the honour of starting the 36th Ryder Cup. He splits the fairway with his drive. But playing partner Tiger Woods belts the ball straight into the water hazard to groans of disbelief from the packed gallery. Colin Montgomerie's ball is in decent shape, if just in the light rough and Padraig Harrington is in prime shape.
0755: To the serious business. . . fashion. The Americans are clad in diamond cut grey and white jumpers, while the Europeans are in green. Something about being in Ireland perhaps?
0744: The first grouping of Colin Montgomerie and Padraig Harrington versus Tiger Woods and Jim Furyk will inevitably be the focus of the first morning. But both captains - Ian Woosnam (Europe) and Tom Lehman (USA) are playing down its importance, calling the match "just another point" towards the total.
0738: Padraig Harrington is on the practice tee. He's got his driver out and is lashing the ball down the fairway as an expectant huddle of fans look on. The mood is quiet at the moment as players try to gear themselves up for what is always a passionate and emotional event.
0730: For three days, every two years, one golf event dominates the sporting world. This is it - the Ryder Cup. And the 36th rendition is set to start in 30 minutes. That is good news in itself. Bad weather had been predicted to disrupt proceedings, but the forecast is fine and the players are warming up.