Spanish third seed Tommy Robredo tumbled out of the Rio Open, losing his second-round meeting with Austrian Andreas Haider-Maurer in straight sets.
Robredo won just five games as his rival scored a 6-3 6-2 win aided by early breaks in both sets to advance to a last eight meeting with either home hope Joao Souza or Slovenian Blaz Rola.
Argentinian Juan Monaco overcame a second set fightback after skating through the first to see off Finn Jarkko Nieminen 6-1 7-6 (7-4).
Spanish second seed David Ferrer, out to deny Rafael Nadal a successful title defence, was later facing Dutchman Thiemo de Bakker.
Women’s WTA second round action brought little cheer for the American contingent as both Grace Min and Bethanie Mattek-Sands bowed out.
Min went down 6-3 6-1 to Israel’s Julia Glushko while Romanian second seed Irina Begu dispatched Mattek-Sands 6-2 6-4.