STANFORD, Calif.—Serena Williams’ busy summer schedule caught up with her, making her the latest U.S. Olympian dealing with a knee injury as the Beijing Games approach.

Williams injured her left knee and pulled out of the Bank of the West Classic on Saturday, becoming the third singles player on the U.S. women’s tennis team with a knee injury.

Williams retired from her match after losing the first set and falling behind in the second set of her semifinal against qualifier Aleksandra Wozniak.

She lasted only 46 minutes before pulling out of the match trailing 2-6, 1-3. Williams said the injury is different than one that forced her to undergo surgery on her left knee in 2003 and miss eight months.

Wozniak will play in today’s final against the winner of the night semifinal between sixth-seeded Marion Bartoli and Ai Sugiyama.



Indianapolis Tennis Championships

INDIANAPOLIS—Top-seeded James Blake struggled after a rain delay and was upset by defending champion Dimitry Tursunov 4-6, 6-3, 6-4 Saturday in the semifinals of the Indianapolis Tennis Championships.

Tursunov, the third seed, will meet second-seeded Gilles Simon of France in the championship match today. Simon outlasted fourth-seeded American Sam Querrey 6-3, 4-6, 6-4 in Saturday’s other semifinal.



Croatia Open

UMAG, Croatia—Top-seeded Fernando Verdasco needed less than an hour to beat Fabio Fognini of Italy 6-1, 6-3 Saturday in the semifinals of the Croatia Open.

In the final, Verdasco will face fourth-seeded Igor Andreev of Russia, who beat Maximo Gonzalez of Argentina.



Dutch Open

AMERSFOORT, Netherlands—Defending champion Steve Darcis reached his third career ATP Tour final Saturday by beating top-seeded Frenchman Marc Gicquel 7-6 (3) 3-6 7-5 at the Dutch Open.

He will play fifth-seeded Spaniard Albert Montanes.



Austrian Open

KITZBUEHEL, Austria—Jurgen Melzer will play Juan Martin del Potro in the final of the Austrian Open.

Melzer beat last year’s runner-up Potito Starace 6-4, 6-7 (8), 6-3 on Saturday to reach his first final of the year, and Del Potro defeated Victor Hanescu 6-3, 7-6 (5).



Gastein Ladies

BAD GASTEIN, Austria—Pauline Parmentier of France will play qualifier Lucie Hradecka of the Czech Republic in the Gastein Ladies final.

The fourth-seeded Parmentier upset top-seeded Agnes Szavay 6-4, 6-2 in Saturday’s semifinal.