But finding this green in two does not give you a two-putt sinecure for par.
Thompson accepted his bogeys and finished with a two-putt birdie on the 18th for a 70.
Instead of hitting his third shot from the tee, he could reach the green for a two-putt par.
From a fairway bunker, Woods hit 8-iron from 178 yards to the middle of the green for a two-putt birdie.
Kerr's sidehill chip left her a long two-putt, and Pettersen's birdie created a two-shot swing and put her in front at -11.
Scott had a two-putt birdie on the opening hole to briefly take the lead, and that was the highlight of his day.
Kuchar had to make a 5-foot par putt to keep the two-shot margin, and Chappell kept coming at him.
If I didn't three-putt two times and lay up in a bunker my score would have been nearer where it should have been.
Starting the final round with a two-shot lead, he made a 15-foot birdie putt on the opening hole and led by at least two shots for all but two holes.
Worse yet, when the taller of the two missed a 5-foot putt, he went on endlessly about how unfair the greens were, even pausing midaddress on the next tee to reiterate: "I still can't believe that thing broke left, " he whined.
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Only four off the lead after two rounds, Montgomerie followed a three-putt bogey on the long second by going in the water at the next and dropping two more strokes.
The burly 22-year-old Lowry led by two shots playing the last but he had a three-putt bogey while Rock birdied.
Earlier, Scotland's Marc Warren had held a two-stroke lead with three holes to play, but a three-putt contributed to a double bogey at the 16th which he followed with a bogey at the 17th.
Fowler pulled to within two shots with a 25-foot birdie putt on the 14th hole, but after he and Woods made bogey on the 15th, Fowler went at the flag on the par-5 16th and came up a few yards short and into the water.
That gave Londoner Wall a chance to tie for second and he did it in dramatic fashion with a 35-foot birdie putt - one which qualifies him for the Open at Hoylake in two weeks' time.
Cink returned from the delay by making a 5-foot par putt, an 18-foot birdie putt and a 10-foot par save on the 17th to get within two shots of the lead.
Mistakes from both in the approach meant Holmes got onto the green in four, and when he came up short with his 45-foot bogey putt Casey was left with two putts for victory from 28 feet.
And he held his nerve, sinking a 15-foot birdie putt on the 16th to go two holes up with two to play and Mahan capitulated on the 17th, fluffing a chip to the green and eventually conceding the hole and match.
Woods, despite his win at Bay Hill two weeks ago, ranks a miserable 134th on Tour in three-putt avoidance.
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Chappell, coming off a 10-foot par save on the 16th hole, made a 20-foot birdie putt on the 17th to get within two shots.
Noren, whose only European Tour victory was at the European Masters in 2009, had a mixed start with three birdies, two bogeys and a double -- and he faces a long birdie putt at the ninth when he returns on Sunday morning.
Jonas Blixt had a 1-foot par putt on the 10th hole and took about two minutes.
Then on the final hole he rolled in a birdie putt to finish on nine-under and claim the tournament by two clear strokes.
Poulter, joint leader overnight on nine under alongside Ross Fisher, moved three shots clear of the field after two early birdies but his first bogey of the week on the fifth, after a three-putt, and another dropped shot on 10 left him level at that stage with Fisher, Kaymer and Jaidee.
Els makes the green in two, but is forced to settle for a par-four and the half point when his 15-foot putt runs along the edge of hole.
He narrowly missed a 24-foot eagle putt in front of a surging gallery on the 18th after reaching the par 5 in two shots.
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