All the latest from the first round (all times BST).
American Chris DiMarco leads at four under after 13 with Australian Mark Hensby on three under in the clubhouse.
Vijay Singh and Luke Donald are also on three under still out on the course, with Phil Mickelson, Retief Goosen and Stuart Appleby on two under.
Northern Ireland's Darren Clarke is in a group one shot back, while England's David Howell fires 72 on his debut.
Tiger Woods is scrambling at two over and South Africa's Ernie Els is struggling at three over.
Latest updates:
0022: The hooter sounds out at Augusta, telling the players that the day's action is at an end due to the darkness.
0018: Padraig Harrington three-putts the 14th to slip back to level par.
0006: Tiger Woods makes par the hard way via a hooked drive, some trees and a long putt on the second to stay two over.
England's David Howell shoots a level-par first-round 72 on his Masters debut.
0000: American Tommy Aaron, the 1973 champion, sets a modest clubhouse lead at seven over after a 79.
Playing partner Charles Coody, who won in 1971, carded 89 while Billy Casper, the 1970 winner, amassed a 34-over 106.
2346: England's Ian Poulter birdies the 13th to get back to one over.
2338: Tiger Woods' approach to the first, his 10th, hits the pin and bounces back into a bunker. He gets down in a bogey five to slip back to two over.
Meanwhile, Ernie Els drops another shot to drop back to three over.
2332: Ireland's Padraig Harrington drops his first shot on the 10th, after nine straight pars, to slip back to level par.
2328: Darren Clarke raps in a 20-foot putt for birdie on the 18th, his ninth, to get to one under.
2324: Ernie Els rouses himself with a birdie at 17 to get back to two over.
2321: England's Paul Casey amasses a quintuple-bogey 10 after two visits to the water on the 13th to slump to eight over.
2318: England's Ian Poulter, resplendent in orange and black, drops two shots in two holes to fall back to two over after 12.
2305: Phil Mickelson rattles in a 10-foot putt on eight to join the logjam on one under, one shot off the lead.
2300: Scottish amateur Stuart Wilson is seven over after 14, while European Ryder Cup captain Ian Woosnam is six over through 14.
2244: Northern Ireland's Graeme McDowell goes out in six over and adds a double bogey at the first, his 10th.
2242: Tiger Woods shaves the hole for eagle at the 15th but moves back to just one over, three off the lead.
2239: Luke Donald, playing on his Masters debut, bogeys the 17th to fall back to one under.
2222: Three-time champion Nick Faldo has walked off the course after eight holes with a bad back. The Englishman was four over par.
2210: Champion Phil Mickelson misses from about 10 feet on the fifth to slip back to level par alongside a clutch of Europeans, including Ian Poulter, Sergio Garcia and Thomas Bjorn.
2158: Tiger Woods shaves the cup on the 13th green, only to see his ball trickle past the hole and off the green into Rae's Creek. He opts to play from where he hit the ball, so putts again, gets down in two and makes bogey.
2147: The leaderboard is starting to take shape with a host of big names such as Mickelson, Singh, Goosen, Weir, Harrington and Donald massing at one under.