Serena Williams (right) has returned to Indian Wells, California, where in 2001 she was taunted when she won a semifinal match against sister Venus when and injury forced Venus to withdraw. (Associated Press)
Serena Williams of the U.S. watches her sister Venus, unseen, in a match against Elena Vesnina of Russia during the first round of Dubai Duty Free Tennis Championships in Dubai, United Arab Emirates, Monday, Feb. 17, 2014. (AP Photo/Kamran Jebreili)
Serena Williams, left, of the U.S. serves as her sister Venus waits at the net during their doubles match against Dominika Cibulkova of Slovakia and Anastasia Pavlyuchenkova of Russia at the All England Lawn Tennis Championships at Wimbledon on Saturday, June 26, 2010. (AP Photo/Sang Tan)
Serena Williams of the United States gestures with her sister Venus, right, during their doubles match against Russian pair Vera Zvonareva and Elena Vesnina at the All England Lawn Tennis Championships at Wimbledon, Wednesday, June 30, 2010. (AP Photo/Anja Niedringhaus)