Top-seeded home favorite Cristian Garin retired from his Chile Open quarterfinal in light of back agony after losing the first set of his match against Brazil’s Thiago Wild.
Wild led 7-6 (1) when Garin retired. Wild will confront Argentina’s Renzo Olivo in the semifinals. Olivo beat 6th seeded Hugo Dellien of Bolivia 3-6, 7-6 (5), 7-5 in the clay-court occasion.
Garin, the Rio Open champ Sunday, left the court looking upset after one hour of play as local fans applauded.
The Chilean had likewise battled with back agony in his round-of-16 win against Spain’s Alejandro Davidovich Fokina.
Norway’s Casper Ruud and Spain’s Albert Ramos-Vinolas will meet in the other semifinal.
The second-seeded Ruud topped Federico Delbonis of Argentina 7-5, 7-5, and the third-seeded Vinolas eliminated Brazilian Thiago Monteiro 6-4, 6-4.