On the day Tiger Woods usually hoists a trophy at Torrey Pines, a newspaper reported Sunday night that the world's No. 1 golfer was busy with the birth of his first son.

The San Diego Union-Tribune, citing an unidentified person with ties to the Woods family, reported that Elin Woods gave birth for the second time. They had a daughter, Sam Alexis, in June 2007 on the day after the U.S. Open.

Woods did not have an announcement about the birth on his website, where he reports his news. Neither his agent nor his spokesman immediately returned messages seeking comment.

The 33-year-old Woods is a six-time winner of the Buick Invitational, where he also won the U.S. Open last summer for his 14th career major. That was the last tournament he has played because of knee surgery a week later that ended his 2008 season. He is expected to return before the Masters, possibly as early as the Accenture Match Play Championship on Feb. 25.

He wrote in a newsletter last week that his return to golf depends largely on the birth of his baby, "which is due pretty soon."

"That takes precedent over anything I do golf-wise," Woods wrote. "Elin, Sam and I are very excited for the new baby to arrive, although that's when the real lack of sleep begins."

Woods was the only child born of his parents, Earl and Tida Woods. He had said after his marriage in 2004 that he looked forward to having more than one child.

Nick Watney won the Buick Invitational on Sunday, the sixth time that Woods has been unable to defend a title since his knee surgery.

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