Defending champion Carlos Alcaraz moved into his second successive French Open final after Lorenzo Musetti retired injured in the fourth set of their semi-final.
Spanish second seed Alcaraz led 4-6 7-6 (7-3) 6-0 2-0 when Italy's Musetti, aiming to reach his first major final, was forced to end the match early.
Eighth seed Musetti needed treatment for a thigh problem at the end of the third set.
The pair have been the leading clay-court players on the ATP Tour this year and showed why in two high-quality, competitive sets.
But once he levelled, 22-year-old Alcaraz unleashed his attacking shots to devastating effect to take control of the match.
Four-time Grand Slam champion Alcaraz, who won Roland Garros for the first time last year, will face either Novak Djokovic or Jannik Sinner in Sunday's final.
Serb sixth seed Djokovic, 38, continues his bid for a standalone record 25th title when he faces Italian world number one Sinner later on Friday.