17-time Grand Slam champion Roger Federer stunned by Tommy Robredo in 4th round of US Open

Roger Federer 's hope of reviving his flagging tennis fortunes under the bright lights of the U.S. Open, where he is a five-time champion, were crushed by a straight-sets loss Monday to a player who had never beaten him in 10 attempts.

http://www.washingtonpost.com/sports/othersports/us-open-tommy-robredo-shocks-roger-federer-in-straight-sets/2013/09/02/fcd6abf8-142f-11e3-b182-1b3bb2eb474c_story.html