Bellucci surprised No. 6 Guillermo Garcia-Lopez of Colombia 4-6, 7-5, 6-3 to advance to the second round, where he'll face Austria's Andreas Haider-Maurer, a 6-2, 4-6, 6-1 winner over Germany's Julian Reister.
Dutra Silva, meanwhile, knocked off Spanish eighth seed Santiago Giraldo 1-6, 7-5, 6-3. He will next face Italy's Paolo Lorenzi, who got past Spanish qualifier Pere Riba 7-5, 6-3.
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