Novak Djokovic of Serbia reacts after losing a point 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/Claude Paris)

Monte Carlo Tennis Masters

Novak Djokovic of Serbia reacts after losing a point 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/Claude Paris)

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