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Serena Williams is back in the Wimbledon final, and still on target for a calendar-year Grand Slam. The top-seeded American beat Maria Sharapova 6-2, 6-4 Thursday in the semifinals on Centre Court, putting the five-time champion in the final at the All England Club for the eighth time. Williams has already won the Australian Open and the French Open this year, and another win on Saturday would give her four majors in a row – a streak that includes last year’s U.S. Open. But a win over Garbine Muguruza in two days would also be a big step toward winning all four Grand Slam tournaments in the same season, something that hasn’t been done since Steffi Graf in 1988.