(121112) -- LONDON, Nov. 12, 2012 (Xinhua) -- Juan Martin Del Potro of Argentina returns the ball during the men's singles semifinal match against Novak Djokovic of Serbia on day 7 of the ATP World Tour Finals in London, Britain, on Nov. 11, 2012. Del Potro lost 1-2. (Xinhua/Yin Gang) (jyc)
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