Fifth-seeded John Isner needed a first-set tiebreaker but advanced with a victory Tuesday in first-round play at the U.S. Men's Clay Court Championship.
Third-seeded Sam Querrey advanced but No. 5 Alexandr Dolgopolov fell Monday in first-round action at the Delray Beach tennis event.
John Isner, who played an 11-hour match against Nicolas Mahut two years ago, beat him in 78 minutes Wednesday at the Hall of Fame Tennis Championships.
Rafael Nadal will open defense of his Wimbledon title against American Michael Russell, tournament officials said Friday in releasing the men's singles draw.
No. 4-seeded Tommy Haas claimed a straight-set victory Tuesday in first-round play of the $600,000 SAP Open tennis tournament in California.
Third-seeded Serbian Novak Djokovic and sixth-seeded American James Blake were among the first-round winners Tuesday in the men's division at the U.S. Open.
Top-seeded Americans Andy Roddick and James Blake won their first-round matches Tuesday at the Indianapolis Tennis Championships.
Second-seeded Russian Dmitry Tursunov and former Top 10 Englishman Tim Henman led Tuesday's first-round winners at The Nottingham Open.
Fourth-seeded Russian Nikolay Davydenko was an easy first-round winner Monday at a rainy French Open.
Defending champion Mardy Fish lost his second round match at the U.S. Men's Clay Court Championships to Argentine Mariano Zabaleta in straight sets.