Volunteers look over centre court during a light rain fall delaying semi-final play at the Rogers Cup tennis tournament Saturday, Aug. 21, 2010 in Montreal. (AP Photo/The Canadian Press, Paul Chiasson)
** FILE ** Roger Federer wipes his face during his men's singles quarterfinal against Tomas Berdych of the Czech Republic, at the All England Lawn Tennis Championships at Wimbledon, Wednesday, June 30, 2010. (AP Photo/Alastair Grant)
ASSOCIATED PRESS Switzerland's Roger Federer reaches for a forehand return against Colombia's Alejandro Falla at the All England Lawn Tennis Championships at Wimbledon, Monday, June 21, 2010.