Serena Williams of the U.S. hits a backhand during her victory over Dominika Cibulkova of Slovakia at the Sony Open tennis tournament in Key Biscayne

Serena Williams of the U.S. hits a backhand during her victory over Dominika Cibulkova of Slovakia at the Sony Open tennis tournament in Key Biscayne

Serena Williams of the U.S. hits a backhand during her victory over Dominika Cibulkova of Slovakia at the Sony Open tennis tournament in Key Biscayne, Florida March 25, 2013. REUTERS/Kevin Lamarque (UNITED STATES – Tags: SPORT TENNIS)