Nadal equalled Federer record for the major titles in history on Sunday with a 6-0, 6-2, 7-5 win.
After the game Federer t9ok to his social media to congratulate the Spaniard for his acheivement.
He said, “I have always had the utmost respect for my friend Rafa as a person and as a champion.
“As my greatest rival over many years, I believe we have pushed each other to become better players,” Federer wrote on Twitter.
“Therefore, it is a true honour for me to congratulate him on his 20th Grand Slam victory.”
The most titles Federer has claimed at a Grand Slam is eight at Wimbledon.
“It is especially amazing that he has now won Roland Garros an incredible 13 times, which is one of the greatest achievements in sport,” Federer wrote.
“I also congratulate his team, because nobody can do this alone.
“I hope 20 is just another step on the continuing journey for both of us. Well done, Rafa. You deserve it.”
This is the first time Federer and Nadal have held the same number of major titles.
When they started their careers, Pete Sampras held the all-time Grand Slam championship record with 14.
Now Federer and Nadal each have 20, and Djokovic owns 17 major trophies.