A bogey at the last compounded a third round where Rory McIlroy failed to fire at the Arnold Palmer Invitational, with a 72 now leaving him four shots adrift of leader Lee Westwood at Bay Hill.
McIlroy also bogeyed the 11th and while he did pick up a shot on 16, he finished the day tied with three other players on seven under.
Lee Westwood's round of 65 included an eagle at the 16th that followed a bogey at the previous hole. The Englishman stands at 11 under and is one clear of Bryson DeChambeau and Corey Conners.
A shot further back are Jordan Spieth and Keegan Bradley, with Tommy Fleetwood just ahead of the quartet on seven under.
At 47-years-old, Westwood is playing at the Arnold Palmer Invitational for the14th time. He has won just twice on the PGA Tour, and his last international win came in January 2020 at the Abu Dhabi HSBC Championship, his 25th career victory on the European Tour.
"It's key at 18 to hit the fairway," Westwood said on the NBC broadcast after his round.
"That was one of my best drives of the day straight up the middle and it left me a 7-iron to the green. I tried to keep it under the hole, short of the hole, and rolled the putt in. I picked a good line, rolled it over my spot and it went in."
After starting the day in a tie for sixth place, DeChambeau moved up the leaderboard with a four-under 68 that included four birdies and a bogey on the front nine.
The most memorable of DeChambeau's front-nine birdies came at the par-five sixth hole that wraps around a lake. Instead of following the fairway, he carried most of the lake on a 370-yard drive that shaved off so much real estate, it left him 70 yards from the hole.
"I was definitely nervous," DeChambeau said about taking a line over the lake that needed over 300 yards of carry to execute. "I caught it pretty solid, and it was definitely 10 mph downwind. I was like, 'Go!' I didn't know how else to react. I think it might have gotten to the green if I hit it more toward the green."
DeChambeau moved to 10-under with a birdie at No 12 then closed with a bogey, birdie and two pars over his final four holes.
Conners started the day with a one-shot lead over Scotland's Martin Laird but was unable to gather any momentum. He had two bogeys and two birdies on the front nine, while going one-under on the back with a birdie at No 12.
Spieth had a roller-coaster third round, starting the day four shots off Conners' lead. He was three-under after two holes Saturday thanks to a hole in one at the 222-yard second hole. He added another birdie on the front nine before two bogeys and two birdies on the back to shoot a four-under 68.
"What a dream start," Spieth said. "Honestly, if you told me on the No 3 tee that if I was to play the course one-under from there with (windy, cool weather)forecasted, I would have signed up for it. I kind of leaked oil coming in today and didn't swing the driver well."