South Africa's Aldrich Potgieter shot a round of 67 to maintain the lead through the third round of the Mexico Open.
Potgieter is at 20 under for the tournament, holding a one-stroke advantage over Brian Campbell (64 on Saturday).
Germany's Stephan Jaeger (66) is three strokes back at 17 under, Alex Smalley (64) sits at 15 under and Ben Griffin (67) and England's Aaron Rai (68) share fifth place a shot further back.
Potgieter, 20, is seeking his first PGA Tour victory in his 10th appearance on the circuit.
A day earlier, Potgieter's 61 made him the fourth-youngest player with that score or better on the tour.
Campbell played the last 10 holes in five under, including a birdie on the last hole, to make a late charge.
He had birdies on the three par-5s on the backside.
That cut into Potgieter's lead, which also was reduced with his bogey on 17.
Defending champion Jake Knapp's 68 put him at six under and tied for 45th
