Roger Federer's US Open preparations could be in danger after the 17-time Grand Slam winner was beaten in his opening match at the Swiss Open while playing with back pain.
Switzerland's Roger Federer returns the ball at Am Rothenbaum in Hamburg, Germany, on July 20, 2013. Federer's worrying slump continued on Thursday when he was knocked out of the Gstaad Open by world number 55 Daniel Brands.
The top seed, who was attending the small claycourt event for the first time since winning it nine years ago, was also dealing with the added stress of testing a new larger racquet, coping with his physical limitations and facing a big hitter in Daniel Brands.
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