Venus Williams of the United States trips during the ladies' singles final against her sister Serena Williams at the 2009 Wimbledon Tennis Championships at the Centre Court in Wimbledon of London July 4, 2009. [Xinhua/Wang Lili]

Venus Williams of the United States serves during the ladies' singles final against her sister Serena Williams at the 2009 Wimbledon Tennis Championships at the Centre Court in Wimbledon of London July 4, 2009. [Xinhua/Wang Lili]