Rafael Nadal cruised to a 6-1, 6-1 victory over Federico Delbonis on Friday, advancing to the semifinals of the Argentina Open.
Sixth-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.
Second-seeded Irina-Camelia Begu of Romania reached the quarterfinals of the Rio Open on Wednesday, defeating Bethanie Mattek-Sands of the United States 6-2, 6-4.
Top-seeded Rafael Nadal defeated Thomaz Bellucci of Brazil at the Rio Open on Tuesday, winning 6-4, 6-1 in his first clay-court match of the season.
John Isner admits that he usually has a rough time in his first tournament match.
Juan Monaco of Argentina beat third-seeded Guillermo Garcia-Lopez of Spain 6-2, 2-6, 6-4 in the Swiss Open second round on Wednesday.
Two-time champion Thomaz Bellucci won his first-round match at the Swiss Open on Tuesday, beating Gerald Melzer of Austria 6-3, 6-4.
David Ferrer's streak of reaching at least the third round at 17 consecutive Grand Slam tournaments ended Wednesday at Wimbledon with a 6-7 (5), 6-0, 3-6, 6-3, 6-2 loss to 118th-ranked qualifier Andrey Kuznetsov of Russia.
Blaz Rola of Ohio State and Nicole Gibbs of Stanford won NCAA singles titles Monday.
NCAA tournament history: Men's tennis