POIPU BEACH, Hawaii - Tiger Woods had a stomach virus and withdrew from the pro-am Monday at the PGA Grand Slam of Golf.
PGA of America spokesman Julius Mason said tournament officials still expect Woods to play in the 36-hole event for winners of this year's majors.
The $1 million event was scheduled to begin Tuesday with Woods attempting to win his sixth Grand Slam title.
Woods, fresh from a successful defense of his title at the Dunlop Phoenix in Japan, told officials early Monday that he was up all night and wouldn't be able to attend the pro-am or clinic.
That left Vijay Singh and U.S. Open champion Michael Campbell as the only participants in Monday's pro-am. Defending champion and PGA Championship winner Phil Mickelson wasn't scheduled to arrive on Kauai until Tuesday.
Mason said Woods' ankle, which he twisted on his tee shot during a playoff hole in Japan, wasn't the problem.
Woods has said his ankle has been bothering him for about a month and that the cold weather in Japan made it worse.
He won six times on the PGA Tour this year, including major victories in the Masters and British Open.