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Serena Williams has completed her second "Serena Slam" after defeating Garbine Muguruza to win Wimbledon on Saturday. Williams' eyes are now set on the U.S. Open next month, where capturing the trophy would give her the coveted "calendar slam" and tie her with Steffi Graf for the most Grand Slams by a woman (22) in the Open era. Claiming the U.S. Open would also put her one back of tying Margaret Court for the most consecutive Grand Slam titles (6).