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MADRID, SPAIN - MAY 12: Roger Federer of Switzerland in action during his semi final against Janko Tipsarevic of Serbia on Day Eight of the Mutua Madrilena Madrid Open at the Caja Magica on May 12, 2012 in Madrid, Spain. (Photo by Mike Hewitt/Getty Images)

MADRID, SPAIN - MAY 12:  Roger Federer of Switzerland in action during his semi final against Janko Tipsarevic of Serbia on Day Eight of the Mutua Madrilena Madrid Open at the Caja Magica on May 12, 2012 in Madrid, Spain.  (Photo by Mike Hewitt/Getty Images)