Novak Djokovic of Serbia, reacts after losing a game 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, reacts after losing a game 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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