Most Powerful Servers

John Isner

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.

Serena Williams

Milos Raonic

Sabine Lisicki

Ivo Karlovic

Samantha Stosur

Jerzy Janowicz

Petra Kvitova

Kevin Anderson

Madison Keys

Nicolas Almagro

Venus Williams

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