DON EMMERT/AFP/Getty Images
By SI.com Staff
September 05, 2014

It's no secret: Serena Williams has a big serve. During the quarterfinals of the U.S. Open, her fastest serve was clocked at 122 mph and was hit in the first set. Find out how fast Williams served based on the round of the tournament and set number, and if she got an ace or won a point on those serves. 

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