Lukas Rosol of the Czech Republic, returns the ball to Roger Federer of Switzerland 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

Lukas Rosol of the Czech Republic, returns the ball to Roger Federer of Switzerland 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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