RIO DE JANEIRO — Rafael Nadal advanced to the semifinals of the Rio Open on Friday without hitting a shot.
The top seed moved on after his quarterfinal opponent Alexandr Dolgopolov of Ukraine withdrew before the clay-court match with a shoulder injury.
Tournament organizers said Dolgopolov hurt his shoulder in a doubles match on Thursday.
Nadal's semifinal opponent will be Pablo Cuevas of Uruguay, who defeated Federico Delbonis of Argentina 6-4, 7-6 (4). The match was delayed for 2-1/2 hours with Delbonis leading 4-2 in the second set.
No. 5 Dominic Thiem upset No. 2 David Ferrer 6-3, 6-2.