Novak Djokovic of Serbia wipes his face at the change of ends as he plays against Roger Federer of Switzerland 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/Michel Euler)

Monte Carlo Tennis Masters

Novak Djokovic of Serbia wipes his face at the change of ends as he plays against Roger Federer of Switzerland 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/Michel Euler)

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