The Moscow-born bagged her second title of 2023 after her Indian Wells triumph and fifth overall when Ukraine's Anhelina Kalinina retired while trailing 6-4, 1-0.
Wimbledon champion Rybakina became the sixth woman since the introduction of the WTA 1000 format in 2009 to win a Grand Slam or Masters title on every surface after Serena Williams, Petra Kvitova, Simona Halep, Garbine Muguruza and Ash Barty.
"I think with my game, I can play good on all the surfaces," said Rybakina, who also reached the Australian Open and Miami finals this season.
"It's just maybe for clay I need to be ready more physically and have a lot of preparation which I don't always have the time for after the hardcourt season."
Rybakina reached the third round at Roland Garros last year and hoped playing in Paris would be easier this time.
"The tournament is pretty long. Hopefully I can go far. I have good memories playing there," Rybakina said.
"Now I've got more matches on clay, so it's a bit easier and there's a bit more confidence, definitely."
Kalinina, whose hopes of a first title were dashed due to a leg injury, said Rybakina had the qualities to succeed on clay.
"She's serving at 200 kph. She's making winners like no one on tour, anyone can win in Paris, but she has good chances," Kalinina said.
"She's an amazing player, a top player. I'm sure if she's going to (play) like this, maybe new world number one for sure."
The French Open begins on May 28.
