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Serena Williams completed her second Serena Slam and won her 21st Grand Slam title (sixth at Wimbledon) with a 6-4, 6-4 victory over Garbine Muguruza on Saturday. At next month's U.S. Open, Williams will attempt to go for the first calendar-year Grand Slam since 1988. She'll also be looking to tie Steffi Graf's record of 22 Grand Slam titles.