keywords: serena schnyder capriati williams quarterfinals
text: Serena Pastes Schnyder, Capriati Next at US Open Serena Williams, hoping her surgically-repaired knee holds out in her quest to capture a third US Open title, pounded No. 15 seed Patty Schnyder in straight sets Sunday to advance into the quarterfinals for a match-up with countrywoman Jennifer Capriati.