Roger Federer advanced Thursday to the semifinals by beating Isner 6-4, 7-6 (5). Novak Djokovic advanced by sweeping Jo-Wilfried Tsonga 6-1, 7-5. Djokovic's opponent in the semifinals will be British hopeful Andy Murray.
Reigning Olympic gold medalist Rafael Nadal will lead Spain's tennis team at the London Games.
Mardy Fish and John Isner have been chosen to play for the U.S. Davis Cup team in the quarterfinals against France on April 6-8.