Juan Martin del Potro and Roger Federer will face off for the first time since 2009 when the two meet in the second round of Cincinnati. The Argentine stunned the Swiss in five sets in the 2009 U.S. Open final and then beat him again in the ATP World Finals later that season, but missed most of 2010 due to a wrist injury. Federer owns a 6-2 lifetime record against Del Potro. "It’s special to play against Roger," said Del Potro said. "I have already beat him twice and know how to beat him. But it is not easy."