Serena Williams is two wins away from the elusive calendar Slam after a three-set victory over her older sister Venus in the quarterfinal of the U.S. Open. Serena moves on to a semifinal match against Roberta Vinci after a 6-2, 1-6, 6-3 win over Venus in front of a star-studded crowd on Tuesday.
For the complete story, visit BleacherReport.com/Tennis.
