When her opponent's final shot sailed out, Serena Williams wasn't sure whether the match was over or not. It took a few seconds before the realization sunk in - not only had she won her sixth Wimbledon title, but her bid for another "Serena Slam" was complete.

Williams overcame a slow start, eight double-faults and a nervy finish to dispatch Garbine Muguruza 6-4, 6-4 on Saturday for her fourth Grand Slam championship in a row and 21st major overall.

The win means Williams holds all four Grand Slam titles at once - completing the second "Serena Slam" of her career. What's more, she secured the third leg of a calendar-year Grand Slam and, if she wins the U.S. Open, will become the first player to sweep all four majors in the same season since Steffi Graf in 1988.

"I can't believe I'm standing here at another Grand Slam," Williams said in an on-court interview after the match. "I'm having so much fun out here. I just never dreamt I would be out here still and let alone winning."

Williams, who won her 28th straight Grand Slam match, is now just one major title behind Graf on the Open era list and three behind all-time leader Margaret Court.

At 33, Williams is also the oldest woman to win a Grand Slam title in the Open era. She has now won eight major championships in her 30s, including her first Wimbledon title since 2012.

"It feels so good," Williams said after accepting the winner's trophy - the Venus Rosewater Dish - on Centre Court from the Duke of Kent. "It's been a little while and you really appreciate holding it."  (Associated Press)

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