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.
Roger Federer endured two rain delays and a shaky moment late in the first set Wednesday to reach the quarterfinals at the Olympics by beating Denis Istomin of Uzbekistan 7-5, 6-3.
Defending champion Spain defeated Israel 3-0 in the Davis Cup semifinals on Saturday.
The Czech Republic has taken a 2-1 lead over Argentina in their Davis Cup quarterfinal series after winning the doubles.