Northern Ireland's Graeme McDowell fired a bogey-free four-under par 68 to remain top of the leaderboard after three rounds of the World Challenge golf tournament in California.
McDowell, the 2010 US Open champion, has a 54-hole total of 13-under 203 in the event hosted by Tiger Woods.
His three-stroke overnight lead slipped to two but he was still well placed to capture his first victory since winning this unofficial 18-man invitational event in 2010.
Keegan Bradley had six birdies in his five-under 67 and is alone in second place on 205.
Three shots further back is tournament host Woods, who carded his second straight 69 and Bo Van Pelt, who hit a 70 for 208.