Roger Federer advances to final at French Open

Roger Federer advances to final at French Open

Roger Federer of Switzerland reacts after winning his semi-final match against Juan Martin Del Potro of Argentina at the French Open tennis tournament at Roland Garros in Paris June 5, 2009.

Roger Federer of Switzerland reacts after winning his semi-final match against Juan Martin Del Potro of Argentina at the French Open tennis tournament at Roland Garros in Paris June 5, 2009

Juan Martin del Potro of Argentina waves after losing his semi-final match against Roger Federer of Switzerland at the French Open tennis tournament at Roland Garros in Paris June 5, 2009.

Roger Federer of Switzerland celebrates winning his semi-final match against Juan Martin del Potro of Argentina at the French Open tennis tournament at Roland Garros in Paris June 5, 2009.

Juan Martin del Potro of Argentina walks off the court after losing his semi-final match against Roger Federer of Switzerland at the French Open tennis tournament at Roland Garros in Paris June 5, 2009.

Roger Federer of Switzerland (L) hugs Juan Martin Del Potro of Argentina after their semi-final match at the French Open tennis tournament at Roland Garros in Paris June 5, 2009.

Juan Martin Del Potro of Argentina congratulates Roger Federer of Switzerland (L) after the latter won his semi-final match against at the French Open tennis tournament at Roland Garros in Paris June 5, 2009.

Roger Federer of Switzerland serves to Juan Martin Del Potro of Argentina during their semi-final match at the French Open tennis tournament at Roland Garros in Paris June 5, 2009.

Roger Federer of Switzerland returns the ball to Juan Martin Del Potro of Argentina during their semi-final match at the French Open tennis tournament at Roland Garros in Paris June 5, 2009.

Juan Martin Del Potro of Argentina returns the ball to Roger Federer of Switzerland during their semi-final match at the French Open tennis tournament at Roland Garros in Paris June 5, 2009.

Juan Martin del Potro of Argentina reacts during his semi-final match against Roger Federer of Switzerland at the French Open tennis tournament at Roland Garros in Paris June 5, 2009.