Roger Federer of Switzerland, returns the ball to Lukas Rosol of the Czech Republic during their third round match of the Monte Carlo Tennis Masters tournament in Monaco, Thursday, April 17, 2014. Federer won 6-4 6-1. (AP Photo/Michel Euler)

Monte Carlo Tennis Masters

Roger Federer of Switzerland, returns the ball to Lukas Rosol of the Czech Republic during their third round match of the Monte Carlo Tennis Masters tournament in Monaco, Thursday, April 17, 2014. Federer won 6-4 6-1. (AP Photo/Michel Euler)

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