American Dustin Johnson holds a one-shot first-round lead at the Northern Trust Open in California.
The 29-year-old shot a five under par 66, which included six birdies.
"I've been playing pretty good all year, so the game's right where I want it to be," said Johnson.
He leads a group that includes Italy's European Ryder Cup star Francesco Molinari and Australian Matt Jones as well as Americans Jimmy Walker, Robert Garrigus and Scott Stallings
American veteran Jim Furyk was a further shot back after firing a 68, joined on that mark by compatriots Keegan Bradley and Rickie Fowler.
South Africa's 2011 Masters winner Charl Schwartzel, England's former world number one Lee Westwood and South Korean KJ Choi all finished their opening rounds on two under, one ahead of US Open champion Justin Rose, Hunter Mahan and former Open champion Ben Curtis.
Ian Poulter had a disappointing day as he shot a one-over-par 72, while Darren Clarke endured a tough 78 before withdrawing because of a chest muscle injury.