Munar will face Chile's Christian Garin in the round of 16 at the clay-court tournament, while Londero will play Bolivia's Hugo Dellien. Dellien, a 25-year-old Bolivian, beat Spain's Pedro Martinez Portero 6-1, 6-2. Dellien reached the quarterfinals of the Rio Open last week.
Also on Tuesday, Spain's Albert Ramos Vinolas beat Argentina's Facundo Bagnis 6-1, 6-3. Brazil's Thiago Seyboth Wild eliminated Sweden's Elias Ymer 6-3, 4-6, 6-2. Norway's Casper Ruud advanced with a 6-3, 6-4 victory over local favorite Thiago Monteiro.
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