Michael Thompson birdied the last to join Luke Guthrie in a tie for the lead after the third round of the Honda Classic.
The American duo sit together on eight under at the summit, two clear of Lee Westwood and Geoff Ogilvy. Rickie Fowler and fellow American Charles Howell III are a further shot back heading into Sunday at Palm Beach Gardens.
Thompson (70) could well have been clear on his own had he put a little more power on his eagle putt at the 18th. Guthrie, meanwhile, signed for a 71 after ending his round with seven successive pars.
Westwood remained in contention despite suffering a disappointing front nine at his 'home' event, including back-to-back bogeys before the turn.
However, the Englishman got to grips with the windy conditions to pick up birdies at the 14th and 17th. Although he found water with his approach to the last, he still managed a par to settle for a score of 70.
"It was tricky," Westwood - who now lives in Florida and is staying at home during the tournament - said afterwards. "We didn't have wind the first couple of days so it came as a bit of a surprise.
"I had to acclimatise quickly and I did. I played quite nicely."
Ogilvy is alongside him in a tie for third, the Australian also managing an even-par round after recovering from three dropped shots in his opening four holes.
"It was a good round. I did the worst possible thing and bogeyed the first two holes," he said after a birdie at the par-five 18th. "That's not what you want to do on a hard day like this.
"But I guess I got them out of the way. I finished the front nine well and then felt really good on the back nine. I think even par is a better-than-average score today."
Justin Rose will have hopes of making a charge on the last day from four shots back but Tiger Woods has surely left himself too much to do after a third successive 70 left him trailing by eight.
The former world No1 was three under after his front nine but couldn't maintain such standards after the turn, a double-bogey five at the penultimate hole not helping his cause.