Marathon match

Argentina's Juan Martin del Potro is not happy with his play against Switzerland's Roger Federer on Aug. 3 in the men's singles semifinal match at the London Games. The match lasted more than four hours.

( Martin Bernetti/AFP/Getty Images )

Argentina's Juan Martin del Potro is not happy with his play against Switzerland's Roger Federer on Aug. 3 in the men's singles semifinal match at the London Games. The match lasted more than four hours.

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