Roger Federer of Switzerland returns the ball to  Novak Djokovic of Serbia, during their semifinal match of the Monte Carlo Tennis Masters tournament in Monaco, Saturday, April, 19, 2014. Federer won 7-6, 6-2. (AP Photo/Claude Paris)

Monte Carlo Tennis Masters

Roger Federer of Switzerland returns the ball to Novak Djokovic of Serbia, during their semifinal match of the Monte Carlo Tennis Masters tournament in Monaco, Saturday, April, 19, 2014. Federer won 7-6, 6-2. (AP Photo/Claude Paris)

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