Maria Sharapova gained revenge over Sabine Lisicki but Venus Williams crashed out and Novak Djokovic was given quite a scare on a dramatic day five of the 2012 Olympic tennis event.
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It hasn't been vintage Sharapova so far at the Olympics but the Russian was delighted after seeing off the dangerous Lisicki 6-7(8), 6-4, 6-3 to set up a quarter-final with Kim Clijsters.
"I was really happy I was able to beat her today," she said. "Obviously losing to her a few weeks ago, I was not really happy with the way that I played, so I wanted to change that result.
Even though I didn't play my best tennis, I was really happy that I got through it and I stepped up when I had to."
But Venus Williams' dreams of winning second Olympic singles gold are over after a 7-6(5), 7-6(5) loss to Angelique Kerber. However Venus can only have herself to blame after missing set points in the first and blowing a 5-1 lead in the tiebreak. She even led 3-1 in the second set but couldn't put away the dogged Kerber.
The men's singles saw Djokovic and Andy Murray involved in tough scraps. Djokovic was stunned by the performance of 31 year old Lleyton Hewitt who came oh so close to a memorable win. Djokovic had to dig deep to prevail 4-6, 7-5, 6-1 and he appears to be heading inexorably towards a semi-final showdown with Murray who beat Marcos Baghdatis 4-6, 6-1, 6-4.
But Roger Federer's chances of winning two golds are over after a surprise defeat in the doubles against the Israelis Jonathan Erlich and Andy Ram. Federer and Stanislas Wawrinka looked unconvincing in their first match and the former world number five pairing took full advantage.