Gonzalez got past Frenchman Gilles Simon 7-6 (8-6), 6-4 in his first action since he suffered a third-round loss at the U.S. Open last month.
Austrian Oliver Marach beat fellow countryman Rainer Eitzinger 2-6, 7-5, 7-6 (8-6).
In other action, German Florian Mayer mauled Italian Alessio Di Mauro 6-2, 6-0; Swiss Stanislas Wawrinka beat Croatian Marin Cilic 6-4, 6-1; and Slovak Dominik Hrbaty beat Italian Simone Bolelli 6-2, 6-4.
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