Dominika Cibulková

Williams of the U.S. serves to Cibulkova of Slovakia during their women's singles match at the Brisbane International tennis tournament in Brisbane...Serena Williams of the U.S. serves to Dominika Cibulkova of Slovakia during their women's singles match at the Brisbane International tennis tournament in Brisbane, January 2, 2014. REUTERS/Jason Reed

Jason Reed/Reuters

Serena Williams of the US serves to Dominika Cibulková of Slovakia during their women’s singles match at the Brisbane International tennis tournament.