Rafael Nadal and Roger Federer will play an exhibition match for charity tomorrow, Tuesday December 21st at 19:30 GMT in Zurich and on Wednesday December 22nd at 18:00 GMT in Madrid. The event is called Match for Africa. The proceeds from the matches will go to the Roger Federer Foundation and Fundaciòn Rafa Nadal.
You can watch these matches on TennisTV.com and on ESPN2. The match in Zurich, Switzerland starts at 11:30 am Pacific Time.