LONDON (CBSNewYork/AP) — Tennis powerhouse Serena Williams won her 21st career Grand Slam title Saturday.

Williams defeated Spain’s Garbine Muguruza in the Wimbledon final in straight sets, 6-4, 6-4.

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Williams is going on a 28-match Grand Slam winning streak and can now count this as her sixth victory at Wimbledon.

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The tennis star is just one win shy of taking the Grand Slam this year, meaning a victory in all four Grand Slam events in one year — the Australian and French Opens, Wimbledon and the U.S. Open.

The win at the All England Club gives Williams a personal “Serena Slam” as she has won the last four majors over the last two years, going back to last year’s U.S. Open.

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