Hal Sutton shot his second successive 66, good for a 12-under total. Greg Chalmers was at 11-under while three golfers stood at 10-under, including Mike Weir, who was scheduled to tee off Friday afternoon.
Cink birdied both the par-5s on the front and threw in a birdie at the par-4 7th. On the back, he included another three birdies, one at the par-5 10th and the others on the par-3 16th and the par-4 finale, the 18th.
Sutton started with a 33 on the front and tacked on another 33 on the back. He birdied two of the four par-5s, Nos. 1 and 12.
Chalmers had seven birdies, but bogeyed the 17th to fall back to -11. Chalmers birdied all four of Doral's par-5s.