Yes. His name is Shane Warne
The Olympic Games that allowed professional athletes to compete were the Summer Olympics starting in 1984 and the Winter Olympics starting in 1992.
2 athletes from Albania will compete at the 2014 Winter Olympics at Sochi, Russia.
6 athletes from Andorra will compete at the 2014 Winter Olympics at Sochi, Russia.
7 athletes from Argentina will compete at the 2014 Winter Olympics at Sochi, Russia.
4 athletes from Armenia will compete at the 2014 Winter Olympics at Sochi, Russia.
61 athletes from Australia will compete at the 2014 Winter Olympics at Sochi, Russia.
130 athletes from Austria will compete at the 2014 Winter Olympics at Sochi, Russia.
5 athletes from Azerbaijan will compete at the 2014 Winter Olympics at Sochi, Russia.
24 athletes from Belarus will compete at the 2014 Winter Olympics at Sochi, Russia.
7 athletes from Belgium will compete at the 2014 Winter Olympics at Sochi, Russia.
Summer Olympians compete from virtually every country. Winter Olympians, about 40%.
5 athletes from Bosnia and Herzegovina will compete at the 2014 Winter Olympics at Sochi, Russia.