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KEY BISCAYNE, FL - APRIL 01: Serena Williams of the United States poses for a photograph with a cake to celebrate her 700th WTA Tour win after her three set victory against Sabine Lisicki of Germany in their quarter final match during the Miami Open Presented by Itau at Crandon Park Tennis Center on April 1, 2015 in Key Biscayne, Florida. (Photo by Clive Brunskill/Getty Images)

KEY BISCAYNE, FL - APRIL 01:  Serena Williams of the United States poses for a photograph with a cake to celebrate her 700th WTA Tour win after her three set victory against Sabine Lisicki of Germany in their quarter final match during the Miami Open Presented by Itau at Crandon Park Tennis Center on April 1, 2015 in Key Biscayne, Florida.  (Photo by Clive Brunskill/Getty Images)