DORAL, Fla. -- With one last birdie putt that never looked like it was going anywhere but in the hole, Tiger Woods walked off the Blue Monster in a familiar position.

He had a four-shot lead over Graeme McDowell in the Cadillac Championship, the 17th time on the PGA Tour that he has led by at least four shots going into the final round. Woods has never lost when leading by that much on tour.

Saturday at Doral was a reminder, however, how quickly it all can change. After Woods knocked in a short birdie putt on the 15th hole, he was six shots ahead of McDowell.

Two holes later, after McDowell chipped in for eagle and Woods found himself staring some 20 feet in the air at his golf ball lodged in a palm tree to the right of the 17th fairway, the lead was cut in half.

Woods saved his best for the final hole. He drilled a tee shot into the fairway, hit 9-iron to 15 feet and made his 24th birdie of the tournament for a 5-under 67, putting him on the cusp of another World Golf Championship and a big step toward returning to No. 1 in the world.

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"After I made birdie on 15, I was looking pretty good with a six-shot lead, and with a drivable par 4," Woods said. "Two holes later, it's now cut down to three. I piped a tee shot down there [on 18], hit a little 9-iron there and was able to pour that putt in there."

The ball didn't fall from the tree, which was about the only thing that didn't fall his way. The 24 birdies and 74 putts through three rounds are personal records for Woods. More importantly, it put him in position to win his 17th WGC title, and his first since 2009.

"He controlled every part of his game very well, very few loose shots," said McDowell, who did well to two-putt for par from 85 feet on the last hole for a 69 that kept him in final group Sunday.