The French Open.
mens: unc. womens: uconn
He's won a total of six times as of the 2011 tournament (2005-2011, except for 2009).
Roger Federer won the French Open at Roland Garros in 2009. This is the only time he has recorded a win in this tournament.
Santoro announced that the 2009 US Open will be his final professional tennis tournament.
Juan Martin Del Potro defeated Roger Federer in five sets in '09