Genesis Open: Justin Thomas leads Adam Scott and JB Holmes after three rounds
American Justin Thomas carded a second successive 65 for a four-shot lead over Adam Scott and JB Holmes after three rounds of the delayed Genesis Open.
The third round had to be completed on Sunday morning after bad light had stopped play the day before.
Thomas had started on 11 under with Scott, but pulled clear with five birdies to card a 65 as Holmes (68) joined the Australian on 13 under.
Northern Ireland's Rory McIlroy and Tiger Woods are also in contention.
Four-time major winner McIlroy birdied the first in his 69, while England's Casey dropped down the field after a level third-round 71.
Woods made a blistering start to his penultimate round after beginning on the 10th, hitting three birdies and an eagle in his first four holes to finish on 65.
The American 14-time major winner had only just made the cut at one under after two rounds at the par-71 Riviera Country Club in Los Angeles.
Play had started at 06:45 local time (14:45 GMT) after play had been dogged by bad weather for the first three days.
Thomas and Scott had similarly early starts on Saturday in order to finish off the remaining holes of their second round in chilly conditions with both players carding 65s.
Scott said: "It wasn't that easy early. It was very cold and hard to have any feel in the hands."