The 36-year-old tennis player from Spain (5th seed) outplayed Alexander Zverev (3rd) from Germany in the 1/2 final match of the playoffs.
The German was injured in the second set when the opponents went to a tie-break with the score 7:6 (10:8), 6:6 in favor of the Spaniard.
Tennis players spent more than three hours on the court.
In the final, Nadal will play the winner of the meeting between Norwegian Kasper Ruud (8th) and Croatian Marin Cilic (20th).
Nadal is a 13-time Roland Garros champion.
The total prize pool of the tournament is over €43 million.
Earlier, the President of the Russian Tennis Federation (FTR), Shamil Tarpishchev, expressed the opinion that Russian tennis players should start preparing for tournaments that are held on hard surface, skipping the grassy part of the season due to being suspended from Wimbledon.