Maria Sharapova defeated Sabine Lisicki of Germany 6-7,6-4,6-3 to reach the quarter finals of 2012 Olympics tennis event. The Russian will meet Kim Clijsters of Belgium who beat Serbia's Ana Ivanovic 6-3,6-4. Meanwhile Wimbledon champion Petra Kvitova outclassed Flavia Pennetta 6-3,6-0 to set a quarter final showdown against another Russian Maria Kirilenko. Kirilenko reached the last eight beating Julia Goerges of Germany in straight sets 7-6,6-3.
Seventh seed Germany's Angelique Kerber defeated three time Olympic gold medalist Venus Williams of USA 7-6,7-6 to reach the quarterfinals. In the first set Williams failed to convert three set points, then blew a 5-1 lead in the tiebreaker. She was up 3-1 in the second set, but Kerber again came back. World number one Victoria Azarenka and former world number one Caroline Wozniacki also earned spot in the quarterfinals