Jack Sock won his first big Challenger title.
Novak Djokovic
The Serbian seems very gung-ho on seizing the No. 1 ranking back from Roger Federer and played with a lot of confidence with his back against the wall in his 5-7 7-6 6-3 win over Andy Murray in the Shanghai final. Of the five match points he faced, Djokovic ripped forehand winners on three and forced two errors off the Scot
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