Venus, Serena Williams

Venus, left, and Serena Williams look on during their doubles match at Wimbledon on Tuesday. Serena Williams defaulted out of the match when she couldn't hit a serve fast enough to register on the speed gun.

( Jan Kruger / Getty Images / July 1, 2014 )

Venus, left, and Serena Williams look on during their doubles match at Wimbledon on Tuesday. Serena Williams defaulted out of the match when she couldn't hit a serve fast enough to register on the speed gun.

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