Julian Finney/Getty Images
By SI.com Staff
September 08, 2014

Although the court measures only 36 feet wide, tennis players log several miles during a match, and often, a player's ability to quickly move around and cover the court equates to points on the scoreboard. See how movement efficiency is a factor for the four men's semifinalists in the U.S. Open and how far the players run during a match. 

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