With the U.S. Open running from Aug. 26-Sept. 9, here's a look at some of the players with the most powerful serves in the tournament. The list starts with Isner, who entered the U.S. Open with 749 aces this year, by far the highest number on the ATP Tour.
2 of 12Matthew Stockman/Getty Images
3 of 12Andrew Brownbill/AP
4 of 12Julian Finney/Getty Images
5 of 12Kevin C. Cox/Getty Images
6 of 12Al Behrman/AP
7 of 12Julian Finney/Getty Images
8 of 12Julian Finney/Getty Images
9 of 12David Goldman/AP
10 of 12Tony Marshall/Getty Images
11 of 12Aaron Favila/AP
12 of 12Julian Finney/Getty Images
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