August 24, 2013
Juan Martin Del Potro of Argentina hits a return ball to John Isner of the U.S. in their semifinal round match at the Men’s Cincinnati Open tennis tournament in Cincinnati, Ohio on August 17, 2013. (John Sommers II/REUTERS)
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There is a familiar but deceiving look about the main contenders set to battle for the U.S. Open men’s singles title when the year’s final grand slam gets underway on Monday.