McDowell and Simpson returned to the 18th for the first extra hole and both hit excellent drives.
The Dubliner's par at the first extra hole earned victory after both Hamill and McGrane had missed the green.
The 19-year-old Italian eagled the third extra hole to deny 2010 British Open champion Oosthuizen his third title of 2012.
Poulter was docked a shot on the second extra hole after he dropped his ball on his marker, leaving Karlsson to win it.
Aguilar, also 38, bowed out at the third extra hole, and the other two matched each other par for par in the next five.
The American, who attended UCLA, made par on the second extra hole, the 10th, while Beljan missed a five foot putt to prolong the playoff.
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The 53-year-old Funk failed to match his rivals' birdies at the first extra hole, the 18th, then Roberts and McNulty were again deadlocked as it was replayed.
Ath the third extra hole, Fisher hit a fairway wood to 12 feet from the pin and Cabrera conceded defeat after finding a bunker and then blasting over the green.
The 28-year-old beat fellow American Troy Kelly with a four-foot birdie putt at the third extra hole to earn a place at the British Open, the FedEx Cup playoffs and next year's Masters.
However, he holed from 15 feet for birdie on the first extra hole, the par-four 18th, to clinch a third European Tour win while his rivals, who were both chasing their first tour wins, could only manage pars.
His daughter made it so with a refusal to lose, even when she failed to cash in on her best shot of the day, an approach on the first extra hole that left her with a 6-foot putt to win.
Faldo was four behind with only six holes to play, but caught Floyd and triumphed on the second extra hole - as he had the year before against Scott Hoch - when the American pulled his approach into the water.
He lost a play-off to Jim Furyk for the Heritage Classic at Hilton Head on 18 April after calling a two-stroke penalty on himself at the first extra hole, but the 35-year-old remains confident that his persistence will pay off.
With the two biggest putts of his career, Scott holed a 20-footer for birdie on the 18th hole of regulation that put him into a playoff with Angel Cabrera, and then won his first major championship Sunday with a 12-foot birdie putt on the second extra hole.
The 28-year-old triumphed one-up after having to play the 18th hole an extra three times, setting up a final clash with American Ryder Cup star Anthony Kim.
This means there is a greater chance of their meeting one another, allowing an extra atom to fill a hole and restore the crystal structure.
The fairways were so firm that tee shots were running some 50 yards after they landed, and the greens were firm enough that balls ran out an extra two feet around the hole.
Always a tight shot through ever encroaching statuesque Georgia pines, the tee has been pushed back and the par-four hole measures an extra 60 yards compared to the 405-yarder the players faced in the early 1990s.
Most of the cuts that lasted longer were worthy of the extra time, such as a crucial chip that the eventual winner, Matt Kuchar, faced on the 16th hole in the final round.
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