Serena Williams makes Olympic quarterfinals; sister Venus loses

Wednesday, August 1, 2012 | 10:09 a.m. CDT; updated 2:28 p.m. CDT, Wednesday, August 1, 2012

WIMBLEDON, England — Three times on a single point, Serena Williams hit a serve that clipped the net cord before plopping into the service box for a let, a sequence that drew giggles from the Centre Court crowd.

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