Serena, Capriati, Roddick Advance at Open (AP) AP - Serena Williams served notice that her shaky knee is holding up just fine, sweeping past Patty Schnyder 6-4, 6-2 Sunday to reach the quarterfinals of the U.S. Open. She faces yet another matchup with Jennifer Capriati, who beat Ai Sugiyama 7-5, 6-2.