Roger Federer of Switzerland returns a shot to Mikhail Kukushkin of Kazakhstan during their Davis Cup quarterfinal at Palexpo in Geneva, Switzerland, April 4, 2014. Federer won the match 3-0. (Xinhua/Wang Siwei)

Roger Federer of Switzerland celebrates his victory over Mikhail Kukushkin of Kazakhstan during their Davis Cup quarterfinal at Palexpo in Geneva, Switzerland, April 4, 2014. Federer won the match 3-0. (Xinhua/Wang Siwei)

Roger Federer of Switzerland returns a shot to Mikhail Kukushkin of Kazakhstan during their Davis Cup quarterfinal at Palexpo in Geneva, Switzerland, April 4, 2014. Federer won the match 3-0. (Xinhua/Wang Siwei)

  Roger Federerof Switzerland celebrates a score against Mikhail Kukushkin of Kazakhstan during their Davis Cup quarterfinal at Palexpo in Geneva, Switzerland, April 4, 2014. Federer won the match 3-0. (Xinhua/Wang Siwei) 

  Roger Federerof Switzerland serves to Mikhail Kukushkin of Kazakhstan during their Davis Cup quarterfinal at Palexpo in Geneva, Switzerland, April 4, 2014. Federer won the match 3-0. (Xinhua/Wang Siwei) 

  Roger Federerof Switzerland returns a shot to Mikhail Kukushkin of Kazakhstan during their Davis Cup quarterfinal at Palexpo in Geneva, Switzerland, April 4, 2014. Federer won the match 3-0. (Xinhua/Wang Siwei) 

  Roger Federerof Switzerland returns a shot to Mikhail Kukushkin of Kazakhstan during their Davis Cup quarterfinal at Palexpo in Geneva, Switzerland, April 4, 2014. Federer won the match 3-0. (Xinhua/Wang Siwei) 

Roger Federerof Switzerland returns a shot to Mikhail Kukushkin of Kazakhstan during their Davis Cup quarterfinal at Palexpo in Geneva, Switzerland, April 4, 2014. Federer won the match 3-0. (Xinhua/Wang Siwei)