Roger Federer of Switzerland in action during his match against Pablo... Nachrichtenfoto - Getty Images
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Tennis - Australian Open - Melbourne Park - 25/1/06 Martina Hingis ( Switzerland) during her match Mandatory Credit: Action Images / Jason O'Brien Livepic Stock Photo - Alamy
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Kei Nishikori of Japan reacts against Roger Federer of Switzerland... Nachrichtenfoto - Getty Images
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Roger Federer of Switzerland swings an oversized racket to return a... Nachrichtenfoto - Getty Images
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Switzerland's Stanislas Wawrinka reacts during his second round match against Czech Republic's Tomas Berdych at the
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