Delbonis, who won the title in Sau Paulo in 2014, was topped by Italy's Lorenzo Sonego 6-4, 6-4. Also on Monday, Chile's Christian Garin beat Portugal's Pedro Sousa 7-6 (3), 6-2. Roberto Carballes Baena of Spain eliminated Maximilian Marterer of Germany 3-6, 6-1, 6-2. Baena will next play third-seeded Guido Pella of Argentina.
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