Pat Perez extended his lead at the CIMB Classic in Kuala Lumpur to four shots after shooting an eight-under-par 64.
The American, looking for his third career victory on the PGA Tour, carded nine birdies against one bogey in his third round, having improved by one shot in every round so far.
Compatriot Xander Schauffele is second after a second consecutive round of 67, while South Korea's Sung Kang sits third.
Japan's Hideki Matsuyama's nine-under-par 63 was the lowest score of the day in the Malaysian capital and took him into a tie for fourth place alongside American Keegan Bradley.
Perez finished strongly with birdies on four of the last five holes, including a 17-foot putt at the par-three 15th.