Sam Stosur defeats top seed Serena Williams in the French Open quarterfinal . Stosur leads 6 - 3 6 - 3 8 - 6 in two hours and 24 minutes to reach semis . Australian player play Jelena Jankovic in last four . Jankovic beat Yaroslava Shvedova in straight sets .
Sam Stosur defeats top seed Serena Williams in the French Open quarterfinal . Stosur triumphs 6-2 6-7 8-6 in two hours and 24 minutes to reach semis . Australian will play Jelena Jankovic in last four . Jankovic beat Yaroslava Shvedova in straight sets .