What's going on with Djokovic?
Emotions at the Olympic tennis event reached a crescendo on Friday, the day when wins assured most competitors of a medal.
There were tears for Juan Martin del Potro, Andy Murray and David Ferrer flung their rackets in disgust, and Roger Federer, perhaps in an effort to release tension, let out a rare smile following a mishit in his marathon outing with del Potro. Jo-Wilfried Tsonga and Michael Llodra rolled around the court like kids wrestling after they edged Ferrer and Feliciano Lopez ...
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