As for the eventual winner, Scott watched in terror as Cabrera's chip on the first playoff hole rolled toward the cup.
Haas hit an even better shot, landing it about 15 feet short of the hole and watching it roll into the cup.
Last week, Uihlein knocked off British Amateur champion Jin Jeong at the Georgia Cup, an 18-hole duel at the Golf Club of Georgia.
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When the ball hit the back of the cup and bounced a few inches past the hole, leaving Guan an easy putt for par, his father yelled, "Yes!"
Cabrera rode a hot putter on the front nine to a slick birdie on the sixth hole on a downhill putt that hit the middle of the cup.
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.
On the 18th hole, Guan stood over his 12-foot putt from the fringe and rolled it perfectly to the edge of the cup, then pumped his fist as it dropped into the hole.
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McDowell, who was second overnight, regained a share of top spot when playing partner Johnson dropped three shots on the second hole and, as the American fell further behind, the European Ryder Cup star was never again headed.
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.
For more than an hour he had tried but failed to get his team Chelsea out of a big hole as the London team desperately attempted to turn their season round in a cup match against Welsh side Swansea City.
The 31-year-old Ryder Cup player, who led from the halfway point, recorded a 72-hole total of 271 (-17) to hold off the challenge of fellow-Englishman Ross Fisher -- whose best-of-the-week 64 was only one outside the West Course record.
The Ryder Cup star could manage only a level-par 73 despite a birdie at the final hole to be tied for 34th in a group off 22 players.
They both chipped close for par on the 18th in the first playoff hole, and Cabrera's 15-foot birdie putt on the 10th grazed the right side of the cup.
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