Stanislas Wawrinka fought back to win the Monte Carlo Masters title with a 4-6 7-6(5) 6-2 victory over Roger Federer.
Roger Federer beat an injured Novak Djokovic 7-5 6-2 to set up an all-Swiss Monte Carlo Masters final with Stanislas Wawrinka.
Novak Djokovic said on Saturday he would not be able to play tennis "for some time".
Stanislas Wawrinka produced a ruthless display to beat Spain's David Ferrer 6-1 7-6(3) to reach the Monte Carlo Masters final.
David Ferrer became only the fourth man with two wins to their name over Rafael Nadal on clay after a 7-6 6-4 win in Monaco.
Rafael Nadal admitted six weeks before his beloved French Open that he has been struggling with his confidence for months.
Defending champion Novak Djokovic thrashed Pablo Carreno 6-0 6-1 to ease into the quarter-finals of the Monte Carlo Masters.
Laura Robson will miss the French Open and Wimbledon after electing to have minor surgery on a troublesome wrist injury.
Claycourt machine Rafael Nadal recovered from a stuttering start to beat Russian qualifier Teymuraz Gabashvili 6-4 6-1.
Laura Robson has been advised to have a wrist injection which would rule her out of tennis until early June.
Novak Djokovic opened his Monte Carlo Masters title defence with a 6-1 6-0 demolition of Spanish qualifier Albert Montanes.
The French Open prize money pool has risen to €25 million (£20m) after the French Tennis Federation announced a cash boost.
Radek Stepanek will face Roger Federer in the Monte-Carlo Masters second round after completing a 6-1 6-2 win over Ivo Karlovic.
Tennis superstar Serena Williams has said how positive and proud she now feels about the body that has seen her dominate women's sport for so long.
Alize Cornet secured a fourth WTA title of her career by beating Camila Giorgi 7-6 5-7 7-6 in the final of WTA Katowice.
Alize Cornet came back from a first set bagel to stun Agnieszka Radwanska 0-6 6-2 6-4 in Katowice.