Gary Woodland holds a one-stroke lead heading into the final round of the OHL Classic at Mayakoba thanks to his third-round 66.
Overnight leader Woodland maintained his advantage heading in the final round at the El Camaleon Golf Club by birdieing seven holes on Saturday.
The two-time PGA Tour champion birdied five of his eight opening holes, before gaining shots at the 11th and 13th, though he double-bogeyed the 15th to be 18 under overall.
A shot behind is Pat Perez, who surged up the rankings with a nine-under-par 62.
Perez was almost flawless, birdieing his first three holes as he went on to eagle the fifth and birdie the seventh and ninth.
Following the turn, Perez bogeyed the 10th hole but picked up shots at the 13th, 14th and 17th.
Pat Perez's front nine on Saturday...-- PGA TOUR (@PGATOUR) November 12, 2016
He's 1 back. pic.twitter.com/U5ZHevbB0J
Scott Piercy is two strokes off the pace following his five-under-par 66.
Irishman Seamus Power is 15 under through 54 holes via his bogey-free 65.
Webb Simpson (69) is 14 under, while Chez Reavie (63), Jason Bohn (65), Luke List (66) and Russell Knox (67) are a shot further back.
Making up the top 10 heading into Sunday are Jhonattan Vegas (65), Martin Laird (66), Ben Crane (67) and Chris Kirk (68).