GIF: Roger Federer clowns opponent in U.S. Open first round
Jason O'Brien / Action Images
Roger Federer just couldn't help himself during first-round action at the U.S. Open.
Fed piled on Marinko Matosevic's frustrating night when he chased down a lob that missed long, but fired it through his legs and straight back at his opponent for good measure.

[Courtesy Cork Gaines]
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