Juan Martin Del Potro of Argentina reacts to a point against Thomaz Bellucci of Brazil during their second round match on Thursday.
The Argentine teenager won 4-6, 6-1, 7-5, 6-3.
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Potro, who is now unbeaten in his last 21 matches, has risen from relative obscurity to 17th in the rankings in what has been a spectacular season.
The Argentine has won four straight titles in Stuttgart, Kitzbuehel, Los Angeles and Washington, DC.
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