MASON, OH - AUGUST 17: Juan Martin Del Potro of Argentina hits a forehand against Jeremy Chardy of France during day seven of the Western & Southern Open at Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)
MASON, OH - AUGUST 17: Juan Martin Del Potro of Argentina hits a forehand against Jeremy Chardy of France during day seven of the Western & Southern Open at Lindner Family Tennis Center on August 17, 2012 in Mason, Ohio. (Photo by Nick Laham/Getty Images)