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This was Nagal's first event on the ATP Tour since his first-round exit from the US Open.
The 33-year-old, who claimed his 19th Grand Slam title at this year's US Open, said that he had not had enough time to practice sufficiently due to inflammation on his left wrist.
Victory for the 23-year-old Russian, contesting a sixth final in a row, was more evidence that he is the prime contender to join the 'Big Three' of Novak Djokovic, Rafael Nadal and Roger Federer.
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