JACKSONVILLE, Fla. (AP) — On Tuesday, Tiger Woods announced via Twitter that he wouldn’t be participating in the 2011 U.S. Open. Injuries to his left knee and Achilles’ will keep him out of the tournament for the first time since 1994.

The Masters is now the only major he has never missed as a pro.

“Not playing in US Open,” Woods said on his Twitter page. “Very disappointed. Short-term frustration for long-term gain.”

Woods said he strained ligaments in his left knee – the same one that has been operated on four times – hitting a shot out of the pine straw in the third round of the Masters. He described it then as a “minor injury,” although it is clearly much more. He said two weeks ago it might have been a mistake to play in The Players Championship, where he had to withdraw after nine holes.

There is no indication when Woods will return.

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