Graeme McDowell and Rory McIlroy are just a shot adrift of leader Tiger Woods after the opening round of the Chevron World Challenge in Thousand Oaks, California.
It is the first time Woods (seven-under-par 65) has been alone at the top of a leaderboard since he won the Australian Masters in 2009.
US Open champion McDowell bogeyed the 18th to drop back into a tie with playing partner and fellow Northern Irishman McIlroy.
They, along with Woods, are well clear of the rest of the field already, with Dustin Johnson and Stewart Cink tied for fourth place on three under, ahead of Luke Donald and Camilo Villegas a further shot back.
Ian Poulter and Jim Furyk are part of a six-way tie for eighth with a level-par score.