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Juan Martin Del Potro, or Delpo, of Argentina serves against Roger Federer of Switzerland in their semifinal of men's singles during the Shanghai Role Stock Photo - Alamy
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Roger Federer and Juan Martin del Potro go head-to-head to reach last four of ATP World Tour Finals | Tennis News | ESPN.co.uk
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Juan Martin del Potro, Other Top Tennis Players Find Success Behind Second Serves | ATP Tour | Tennis
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Juan Martin Del Potro: 5 Reasons Why He Can Topple Nadal, Federer and Djokovic | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
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Juan Martin Del Potro: 5 Reasons Why He Can Topple Nadal, Federer and Djokovic | News, Scores, Highlights, Stats, and Rumors | Bleacher Report
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