Joao Sousa (4), Portugal, def. Renzo Olivo, Argentina, 6-2, 6-4.
Federico Delbonis (7), Argentina, def. Casper Ruud, Norway, 7-5, 6-3.
Guido Pella, Argentina, def. Carlos Berlocq (8), Argentina, 7-5, 6-3.
Albert Ramos-Vinolas (2), Spain, def. Gastao Elias, Portugal, 6-4, 7-6 (5).
Marcus Daniell, New Zealand, and Marcelo Demoliner, Brazil, def. Dusan Lajovic, Serbia, and Eduardo Russi Assumpcao, Brazil, 6-3, 6-1.
Pablo Carreno Busta, Spain, and Pablo Cuevas (1), Uruguay, def. Johan Brunstrom and Andreas Siljestrom, Sweden, 6-4, 3-6, 10-7.
Facundo Bagnis and Guillermo Duran, Argentina, def. Julio Peralta, Chile, and Horacio Zeballos, Argentina, 7-6 (4), 7-5.
This story has been automatically published from the Associated Press wire which uses US spellings