Adam Scott ended Australia's long wait for a Masters champion after another thrilling final day at Augusta National.
The 32-year-old nailed a 15-foot birdie putt on the second extra hole against 2009 champion Angel Cabrera to clinch his long-overdue maiden major crown.
Cabrera had duelled for the lead for much of the day with Scott's compatriot Jason Day, who got off to a flying start when he birdied the first and holed out from a greenside bunker for eagle at the next.
After Day's challenge faltered down the stretch, Cabrera arrived on the 18th tee tied for the lead with Scott, who birdied 13 and 15 and then piled on the pressure as he rolled in superb 25-foot birdie putt to cap a flawless three-under 69.
But Cabrera was up to the task, defying the heavy rain to split the fairway and knock a sweetly-struck iron to two feet to match Scott's three and forced extra holes.
The popular Argentine shaved the cup with his chip for birdie back at 18 as the first play-off hole was halved in par, and both hit excellent approaches to the 10th as the light faded.
Cabrera's putt curled agonisingly past the hole, and Scott held his nerve to find the middle of the cup to become Australia's first winner at Augusta in the 77th edition of the tournament.
Day had been three off the lead at the turn, but three consecutive birdies from the 13th took him two ahead on nine under after Cabrera found Rae's Creek at 13 and bogeyed.
But Day flew the green at 16 and could not get up and down, and he dropped another shot at the 17th as he signed off with a 70 to finish on seven under.
Tiger Woods' bid for a fifth title was hampered by a cold putter from the start as he stuttered to the turn in 37, although birdies at nine, 10, 13 and 15 salvaged a 70 and a top-four finish on four under.
Woods shared fourth with another Australian, Marc Leishman, who also could not get much to drop on the greens in a battling level-par 72.
Brandt Snedeker started the day tied for the lead with Cabrera, but after an opening birdie he bogeyed the fourth and fifth before getting back to eight under at the eighth.
But his race was run after bogeys at 10, 11 and 14, and another dropped shot at the last added up to a 75 which left him alongside Thorbjorn Olesen on four under.
Olesen had been seven over par after five holes of his second round, but he vaulted up the leaderboard with a third-round 68, which he matched on Sunday to ensure a return to Augusta next year.
Lee Westwood threatened to mount a significant challenge with birdies at the second and seventh, but he saw a succession of putts slide past the cup as he closed with a 71 to finish six behind with Sergio Garcia.