Saturday's semifinal between three-time champ Serena Williams and world No. 1 Caroline Wozniacki is the most anticipated women's match of the summer.
The early losses of No. 3 Maria Sharapova, No. 5 Petra Kvitova, No. 6 Li Na and No. 8 Marion Bartoli, above, was one of the themes of week one.
Maria Sharapova, the 2006 U.S. Open champ, is enjoying her highest world ranking since her return from a 2008 injury. But Serena's still the favorite.
Dropping out of the rankings due to injuries in 2010, Sabine Lisicki has climbed back to No. 26 on the strength of a monster serve.