Sicth-seeded Jiri Vesely of the Czech Republic was knocked out in the first round of the Argentina Open on Tuesday, beaten by Blaz Rola of Slovenia 6-4, 6-3.
No. 8 Pablo Carreno Busta of Spain retired due to injury while trialing 7-6 (2), 3-0, with Federeico Delbonis of Argentina progressing in the outdoor clay event.
Top-seeded Rafael Nadal plays Wednesday against Facundo Arguello of Argentina, who defeated Albert Montanes of Spain 6-3, 6-2. Nadal lost last week in the semifinals in Rio de Janeiro. He has failed to make a final in three events this season.
Nadal has a bye into the second round, as do No. 2 seed Tommy Robredo of Spain, No. 3 Pablo Cuevas of Uruguay and No. 4 Fabio Fognini of Italy.