Serena pulls out of Stanford semi with hurt knee

' 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. Tennis scores Need the scores from any match played in this or any other tournament? Results Williams retired from her match after losing the first set and falling behind in the second set of her semifinal against qualifier Aleksandra Wozniak. "It was hurting in practice and I didn't really practice too long because it was hurting," Williams said. "After I got off, it was really swollen. I thought that I have to play really fast." She lasted only 46 minutes before pulling out of the match trailing 2-6, 1-3. Williams... [read full story]