Venus, left, and Serena Williams of the U.S walk off court hand in hand after retiring from their women's doubles match against Kristina Barrios of Germany and Stefanie Voegele of Switzerland at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday July 1, 2014. (AP Photo/Pavel Golovkin)

Britain Wimbledon Tennis

Venus, left, and Serena Williams of the U.S walk off court hand in hand after retiring from their women's doubles match against Kristina Barrios of Germany and Stefanie Voegele of Switzerland at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday July 1, 2014. (AP Photo/Pavel Golovkin)

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