All the action from the second round at Olympia Fields.
Jim Furyk and Vijay Singh lead the US Open at seven-under-par.
Singh, who started late in the day, blazed his way to a stunning 63.
Furyk, who started the day at three-under, picked up four shots on his way to a 66.
Defending champion Tiger Woods overcame a shaky start to his round to card a 66 to lie three off the pace.
Leaderboard (US unless stated):
-7 J Furyk (after 36), V Singh (36)
-5 S Leaney (36)
-4 N Price (36), E Romero (Arg) (36), F Jacobson (36), T Woods (36)
All times BST
2349: Padraig Harrington misses a putt for par on the 18th and looks likely to finish one over for the tournament. Justin Rose has one hole to play and is currently one over.
2344: Fred Couples cards three bogeys in five holes and is now two over par.
2332: Vijay Singh ends his round with a tap-in for par after a stunning 63. He shares the lead with Jim Furyk, who earlier shot a 66.
2319: Vijay Singh again just misses his birdie putt - this time at the 16th - and stays in a share of the lead.
2310: Tiger Woods just fails to chip in from off the green on the 18th but taps in for a 66 that could have been considerably worse. Ernie Els finishes with a birdie for a 70 to lie one under for the tournament. Two holes behind Vijay Singh sets up yet another birdie chance.
2306: Vijay Singh misses by an inch at the 16th and remains in a share of the lead. Tiger Woods is just off the front of the green at the 18th.
2301: Tiger Woods, Ernie Els and playing partner Ricky Barnes all rifle massive drives down the 18th. At the 16th Vijay Singh sets up yet another birdie chance as he sends his approach 12 feet from the hole.
2258: Tiger Woods saves par at the 17th after a fine chip leaves him a simple par putt. The world number one stay at four under.
2249: Vijay Singh birdies the 15th to move into a share of the lead with long-time leader Jim Furyk.
2248: Tiger Woods fires his drive over the back of the green at the 17th and down into the run-off area.
2241: Vijay Singh closes to within one shot of the lead as he birdies the 14th.
2238: Tiger Woods picks up a three at 16 to move to four under with two holes left to play.
2234: Tiger Woods hits a glorious approach at the 16th to give himself another birdie chance. Woods has been playing well tee to green in the last few holes but not holing his putts.
2226: Second-placed Stephen Leaney gives himself a long birdie putt at the 5th - his 14th. If he makes it he would go to six under.
2226: Tiger Woods produces a great drive off the tee at the 16th while Vijay Singh birdies the 13th to move to five under.
2221: Tiger Woods misses his birdie putt at the 15th and stays three under. Ernie Els taps in his short birdie putt to move to two under.
2216: Vijay Singh has come up with another birdie and is now three off the lead at four under.
2214: Tiger Woods rifles an eight iron to within 10 feet at the par-three 15. After a shaky start, when he was spraying the ball all over the place, Woods' game has tightened up considerably. At the 15th Ernie Els produces a glorious shot and misses a hole-in-one by no more than two feet.
2210: Tiger Woods pulls his putt at 14 and misses to the right by a couple of inches before tapping in for a par to stay three under.
2207: A fine approach on the 14th gives Tiger Woods a birdie putt and the chance to go four under for the tournament.
2154: A fine approach at 13 sets up Tiger Woods for a birdie which takes him back to three under for the event.
2139: Tiger Woods makes a fine attempt at a long birdie putt on 12 but the ball fades away at the last and finishes two feet from the hole.
2134: Tiger Woods sends a solid iron into the middle of the green at the 12th but his chances of a birdie look remote. Ernie Els pushes his approach off to the right. The wind is really picking up and conditions are now the toughest they have been all week.
2128: Vijay Singh picks up a birdie on the 10th to move to three under for both the day and the tournament. At the 12th Ernie Els finds the middle of the fairway with his drive, as does Tiger Woods, but he is 15 yards behind the big South African.
2122: Tiger Woods drops a shot on the 11th to slip back to two under after a poor drive off the tee with a three wood.
2108: Stephen Leaney moves to four under as he birdies the 18th - his ninth. Tiger Woods misses a long birdie putt at the 10th as Ernie Els misses from a third of the distance but both make par.
2058: Tiger Woods leaves his approach to the 10th 30 feet short despite changing from an eight iron to a seven. Ernie Els takes a six iron from a bunker and lands it 10 feet from the pin.
2048: Ernie Els drops a shot at the 9th after a poor tee shot but Tiger Woods taps in for a birdie three to go to three under. Despite playing some poor shots Woods is out in 33.
2041: Tiger Woods fires an eight iron from 202 yards to within a couple of feet at the 8th, while Ernie Els can only play out onto the fairway.
2036: Ernie Els sends his drive on the 9th way to the right as his driving continues to let him down. Tiger Woods just avoids a bunker but now has a great position for his approach.
2030: Tiger Woods shows his ability as he gets down in two at the 8th, holing a six-footer to save his par and stay two under.
2013: Tiger Woods rolls a long putt inches past the hole on the 7th and looks set for a par to stay two under. Playing partner Ernie Els also just misses a birdie chance and stays on two under after his birdie at the last hole.
2006: Tiger Woods misses his eagle putt on the sixth but only has a four-footer to take him back to two under, and he duly rolls it in.
1955: Colin Montgomerie, on two under, gives himself a birdie chance at the fourth with a fine iron to within 10 feet. Up ahead Tiger Woods bends it like Beckham to get the ball round an inconvenient tree and land the ball within 10 feet on the sixth.
1949: Tiger Woods chips onto the fifth green but leaves the ball a long way short of the hole and fails to make par, dropping back to one under. Ernie Els makes par to stay on the same score.
1939: Tiger Woods collects a second birdie at the fourth to move to two under but hits his approach short at the fifth and the ball rolls back from the front of the green 30 yards down the sloping fairway. Ernie Els lands his second 10 yards from the pin.
1920: Tiger Woods finds the green but is miles from the pin at the first of the par threes. Ernie Els finds the other side of the green, also a long way from the hole.
1906: Tiger Woods leaves his birdie attempt at the 2nd just short and taps in for par to stay one under. Colin Montgomerie is underway with a fine tee shot at the first, while Ernie Els saves par at the second with a 10-foot putt.
1858: Tiger Woods sends his eight-iron approach to the second into the rough at the back of the green about 12 feet from the hole. Ernie Els leaves his second, from a bunker, on the fringe at the front.
1850: Tiger Woods rolls in a 20-footer for a birdie at the 1st to move to one under. Ernie Els pushes his birdie chance wide.
1842: Tiger Woods finds a bunker to the left of the first green, while Ernie Els, who was in great position, puts his in one to the right. Nick Price holes his par putt at the 18th for a 65 to lie four under, three off the lead.
1833: Tiger Woods gets his round underway by driving into the trees to the right of the first fairway, while playing partner Ernie Els rifles a drive straight down the middle.
1826: Tom Watson birdies the 14h to move back to four under par.
1815: Jim Furyk misses a birdie putt on the 18th but finishes with a 66 to set the standard at seven under par. His two-round total of 133 is a US Open record.
1809: Phil Mickelson stays on level par as he misses a birdie putt at the 18th. Darren Clarke holes out for a 69 to lie one under after two rounds.
1757: A three-putt from 15 feet takes Tom Watson out of second place as he suffers a double-bogey at the 12th.
1750: Nick Price moves to five-under for his round and three off the lead after another birdie.
1740: Eduardo Romero continues his run up the leaderboard with a third birdie in four holes to get to four-under.
1735: Robert Damron finishes his second round of 68.
1725: Another birdie for Darren Clarke takes him to two-under-par.
1720: Another birdie for Jim Furyk gives him a two-shot lead.
1700: Jim Furyk birdies the 13th hole to become outright leader on six-under-par.
1640: Nick Price gets to three-under after a wonderful birdie at the 10th. At the same time Robert Damron loses his share of the lead after he pays for an approach into the rough at the 14th.
1635: Tom Watson birdies the eighth to return to five under and a share of the lead.
1620: Nick Faldo's awful US Open tournament continues as he suffers a double bogey at the 17th (his eighth) to fall to eight-over-par.
1600: Tom Watson bogeys the fifth hole to fall back to four under. Robert Damron birdies the 11th to join Jim Furyk at the top.
1525: Northern Ireland's Darren Clarke birdies the par-three 7th to join a large group on one under. Nick Faldo continues to struggle, falling a shot further back to six over after six.
1510: The always dependable Jim Furyk birdies the par-five 6th to join Watson on five under.
1445: Quigley birdies the 6th to recover one of his dropped shots and joins a group of five players on four under, one shot behind Tom Watson.
1415: Quigley, a journeyman pro still chasing his first career win, continues to ship strokes, dropping his second of the day at the 4th.
1400: Darren Clarke and Phil Mickelson make solid starts to their day's work with pars at the first, but Jim Furyk, the other member of the group, birdies the hole to go to four under.
1340: Robert Damron moves into the top 10 when a birdie
at the 2nd takes him to two under.
1315: Brett Quigley makes a poor start to his second round when he three-putts the 10th, his first, to slip back to four under par. His playing partner Brian Davis cards a par to remain on one over for the tournament.