Halle - Retirement isn't an issue for Roger Federer, who said on Friday he could imagine playing for Switzerland at the 2016 Olympics in Brazil.
The 16-time Grand Slam champion will play at the 2012 Olympics in London. But the 31-year-old tennis superstar believes he can play on.
"But why should London be the end? Why shouldn't I be able to look forward to Rio?" Federer said in an interview in the German daily Die Welt.
"I would be 35-years-old. And at that age other players have had amazing performances. Look at Andre Agassi. He set a new standard."
Agassi won the 2003 Australian Open at age 32.
Federer, who is currently playing the Wimbledon warm-up in Halle, finished fourth in singles at the 2000 Olympics and won gold in doubles in 2008.