Henrik Stenson held a one-stroke lead over Bryson DeChambeau with Rory McIlroy, Justin Rose and Rickie Fowler pushing into contention and Tiger Woods five shots back after the third round of the Arnold Palmer Invitational.
Stenson goes into the final round with a one-shot lead for the second time in four years at Bay Hill, where he has never won.
But the 36-hole leaders couldn't expand their edge, allowing Rose, McIlroy and Woods among others to charge into a Sunday showdown, 12 rivals in all within five strokes of Stenson at the Orlando layout.
Woods made another bold play on the par-5 16th, this time with his ball near the lip of a bunker.
It was the Northern Irishman's best US PGA round since the first round last August at Akron and he stood third on 206 a week after missing the cut.
"I'm going to have to shoot a low one tomorrow and probably get a little bit of help", he said.
Playing on a sponsor's invite the 22-year-old said before the round his plan was to be aggressive as he looks to make the most of few opportunities on the main Tour this year.
Englishman Rose (67) and American Ryan Moore (69) were a stroke back on nine-under.
Woods, an eight-times victor of the event, birdied the 18th for a 69 and a share of 10th at 209. I don't know, I think it's gotten a little much, to be honest. "I've got a headache after all that". "Maybe a low [score] tomorrow will give me a chance to kind of steal one".
McIlroy, 28, hit an eagle on the 12th, along with four birdies to move to 10 under at Bay Hill as he seeks his first victory since September 2016.
Another bogey and birdie followed before he finished his round birdie-bogey-birdie.
But an errant tee shot at the par-5 16th led to a bogey and he dropped another shot at the 17th to fall well off the pace at 10 under.
And on the final hole, a 12-foot birdie putt was punctuated by an enthusiastic fist pump.
Six months after Woods wasn't sure if he would be able to compete again at a high level, he is the betting favorite at Bay Hill.
Woods curled in a 12-foot birdie putt at the par-4 18th to complete his day, cocking for a full-speed fist pump before adopting a mellow low-key finish.
After opening rounds of 68 and 72, Woods posted a 3-under 69 in the third round, thanks to six birdies against three bogeys. He made up for it best that he could by making more than 115 feet worth of putts.