There is a three-way tie for the lead at the AT&T Pebble Beach National Pro Am but, after a good start, Tiger Woods ended the first round five shots off the summit.
Kyle Stanley took advantage of Spencer Levin's final round collapse to win the Waste Management Phoenix Open on Sunday.
England's Robert Rock held off the challenge of Rory McIlroy and Tiger Woods to win the Abu Dhabi HSBC Championship.
Kyle Stanley holds a one-shot lead at the midway point of the Farmers Insurance Open, but local favourite Phil Mickelson has missed the cut at Torrey Pines.
Colombia's Camilo Villegas and David Toms of the United States are deadlocked at the top of the leaderboard after round one of the PGA Tour’s Humana Challenge.
Johnson Wagner lifted his third PGA Tour title on Sunday after securing a two-shot victory at the Sony Open at Hawaii’s Waialae Country Club.