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Serena Williams of the U.S. reacts during women's singles match in Melbourne

Serena Williams of the U.S. reacts during her women's singles match against Ana Ivanovic of Serbia at the Australian Open 2014 tennis tournament in Melbourne January 19, 2014. REUTERS/Petar Kujundzic

Serena & Venus Williams at the Olympics

Williams sisters Venus and Serena compete for gold at the All-England Club in London during the Olympics.