NEW YORK (AP) Caroline Wozniacki has been seeded No. 1 at a Grand Slam tournament for the first time, getting the top spot at the U.S. Open because Serena Williams pulled out injured.

Wozniacki is ranked No. 2 behind Williams by the WTA. She was the runner-up at Flushing Meadows last year and is the first woman since 2003 to be seeded No. 1 at the U.S. Open without having won a major.

Defending champion Kim Clijsters is No. 2 in the seedings released Tuesday by the U.S. Tennis Association. She is followed by 2000-01 winner Venus Williams and 2008 runner-up Jelena Jankovic.

The seedings adhere strictly to the rankings.

Rafael Nadal is the No. 1-seeded man, with Roger Federer at No. 2.

The U.S. Open begins Monday.

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