Dustin Johnson will take a three-shot lead into the final round of the WGC-HSBC Champions tournament in Shanghai.
The world number 23 hit 10 birdies in another excellent display in China, but a double bogey on the final hole gave hope to the chasing pack.
Defending champion Ian Poulter hit eight birdies and an eagle on that saw him move into second place, while Graeme McDowell is a shot further adrift in third.
Justin Rose and Rory McIlroy are eight shots behind on 12-under-par, with Martin Kaymer moving 31 places up the leaderboard thanks to a course-record 62.
