Venus and Serena knocked out of ladies ' doubles at Wimbledon . Williams ' sisters beaten by Russians Elena Vesnina and Vera Zvonareva . The US Open is the first Grand Slam tournament to be played on a Sunday since 2009.
Venus and Serena knocked out of ladies ' doubles at Wimbledon . Williams ' sisters beaten by Russians Elena Vesnina and Vera Zvonareva . It is Venus and Serena 's first defeat in the doubles at Wimbledon since 2003 .