Argentina's Fabian Gomez and Scott Brown from America share a four-shot lead going into the final day at the Puerto Rico Open.
Searching for his maiden victory on the PGA Tour, Gomez carded a seven-under-par 65 to finish at 18 under 198 at the Trump International Golf Club.
Six of his eight birdies came on the front nine with his only dropped shot at the 10th hole.
"There are many good players in this field and it's a course where you can go low," said Gomez of the conditions. "So you have to work hard and play well.
"If it gets windy, that'll be better. It will play a little more difficult. If there's no wind, you will need a lot of birdies to win."
The 29-year-old Brown joined Gomez at the front after a 67 on Saturday. He started with back-to-back birdies, but dropped a shot - his only one for the day - on the eighth before picking up four more shots on the back nine.
"It's a position I've never been in before," said Brown. "But I'm playing good. So I look forward to good things."
Americans Blayne Barber, Brian Stuard, Jordan Spieth and Steve LeBrun are four shots off the pace on 203 with their compatriot Morgan Hoffmann another stroke behind.
Australian Matt Jones walked away with the best round of the day as his eight under kept him six shots off the two leaders.
Overnight leader Andres Romero tumbled down the leaderboard with a three-over 75 that included a triple bogey on the par-four 12th.