American Serena Williams had no difficulty in advancing to the Quarterfinals in the Women's draw at the Olympics. She defeated 13 seed Vera Zvonareva 6-1, 6-0 in impressive fashion. The match only lasted 51 minutes as Williams was fueled by a dominating first serve that she placed 72% in play.

Venus Williams struggled with her serve all day and Angelique Kerber of Germany defeated the American, 7-6, 7-6. Williams had 7 double faults in the match which proved to be a huge factor in the match. Kerber, the 7th seed will move on to face top seed Victoria Azarenka in the Quarterfinals. Williams is still in competition in doubles with Sister Serena.

Joining Serena Williams is Kim Clijsters of Belgium who advanced against 11th seed Ana Ivanovic 6-3, 6-4. 14th seeded Maria Kirilenko advanced into the quarters as well with a 7-6, 6-3 victory over German Julia Goerges.

On the Men's side, Roger Federer moved into the Quarters with a 7-5, 6-3 win over Denis Istomin. Joining Federer is Juan Martin Del Potro of Argentina who won in three sets over Giles Simon of France. 2nd seed Novak Djokovic shook off fiesty veteran Lleyton Hewitt in three sets to move into the Quarterfinals. Hewitt took the first set but Djokovic fought back to advance. Nicolas Almagro of Spain advanced as well defeating Steve Darcis of Belgium in straight sets.

Murray, Isner, Sharapova, Wozniacki Advance

Andy Murray lost the first set to Marcus Baghdatis of Cyprus 4-6. But battled back in the second winning the set easily at 6-1 then the third at 6-4 to win and advance to the Quarterfinals. An emotional Murray exploded into celebration after the win while a tearful Baghdatis saluted the crowd as he left. Murray will face Almagro in the Quarters.

John Isner held off Janko Tipsarevic of Serbia 7-5, 7-6 with a marathon tiebreaker in the second set that went 16-14. Isner will move on to the Quarterfinals where he will meet Roger Federer who who the Championship in Wimbledon singles just a few weeks ago.

Maria Sharapova of Russia lost the first set to Sabine Lisicki of Germany in a tiebreaker in Women's singles 6-7. She rallied to take the second set 6-4 and finished with a 6-3 third to move on to the Quarterfinals. She will face Kim Clijsters of Belgium next.

Caroline Wozniacki of Denmark, the 8th seed, defeated Daniela Hantuchova 6-4, 6-2 to advance. This will create a huge match against Serena Williams next for Wozniacki.

(photo courtesy of Kathleen Shann)