Rory McIlroy moved to within touching distance of winning his first PGA tour title since 2012, hitting a one-under 69 to lead the field going into the final round at Florida's Honda Classic.
The Northern Irishman mixed four birdies and three bogeys but leads American Russell Henley by two shots.
Scotland's Russell Knox carded a 68 to go third, one shot behind Henley, while England's Luke Donald is joint fifth.
"It's all about not making mistakes, limiting the damage," said McIlroy, 24.
One year after frustration prompted him to walk off the same course at Palm Beach Gardens, the two-time Major winner is hopeful he can avoid further misfortune.
"You're going to make a few bogeys. If you limit those, hit fairways and greens, that's what I'm trying to do."
World number 206 Knox, who scored a 63 in round two, carded birdies at 16 and 17 to stay in the running.
"I would have taken 68 before I teed off," said the 28-year-old Scot. "It was windy, it was tough out there, I'm thrilled.
"Hopefully I can do the same on Sunday. I feel great and am looking forward to my chance. You never know."