Juan Monaco beat eighth-seeded Maximo Gonzalez 7-6 (4), 3-6, 6-1 in an all-Argentine match.
Bjorn Phau of Germany, Potito Starace of Italy, Austria's Daniel Koellerer, Peter Luczak of Australia, Kristof Vliegen of Belgium and Juan Monaco of Argentina also reached the second round of the clay-court tournament.
Schiavone advances to 2nd round in Prague