Caroline Wozniacki easily ended the run of teen sensation Melanie Oudin at the U.S.

Unseeded Yanina Wickmayer beat Kateryna Bondarenko 7-5, 6-4 Wednesday in a women's quarterfinal at the U.S.

Defending champion Serena Williams and 2005 champion Kim Clijsters will face off in the semifinals at the women's U.S. Open tennis. Both won their quarterfinal matches Tuesday. The second-seeded Serena beat Italian Flavia Pennetta 6-4, 6-3 in one hour and 15 minutes. A three-time U.S.

Former world No. 1 Kim Clijsters, four years removed from her U.S. Open victory, Tuesday breezed into the semifinals of the 2009 tournament in New York. The 26-year-old Belgian, a wild card who upset third-seeded Venus Williams Sunday, broke Li Na's serve four times en route to a 6-2, 6-4 victory.

Second-seeded Serena Williams advanced to the quarterfinals Thursday with a 6-1, 6-4 third-round win over Alona Bondarenko at the Rogers Cup in Toronto. The reigning Wimbledon, Australian Open and U.S.