Tennis is becoming an increasingly physical sport.
Matches are longer, points are more grueling, and only the most athletic players can make it to the ends of big tournaments.
As a result, tennis players have become some of the most physically fit athletes in the world.
The sport might have a reputation for courteousness, but these men and women are built like MMA fighters.
Grigor Dimitrov, boyfriend of Maria Sharapova, is one of the rising stars of men's tennis.
Simona Halep is one of the fastest players on tour.
Genie Bouchard, at age 20, is poised to be the next big thing.
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