Zvonareva could potentially meet Serena in the single 's final if both win their semifinals on Thursday . 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 . The US Open is the first Grand Slam tournament to be played on a Sunday since 2009.