Novak Djokovic(L) of Serbia and Stan Wawrinka of Switzerland compete during the second round of men's doubles against Daniel Nestor of Canada and Nenad Zimonjic of Serbia at the 2014 Rogers Cup in Toronto, Canada, Aug. 6, 2014. Novak Djokovic and Stan Wawrinka lost the match 0-2. (Xinhua/Zou Zheng)
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