Nadal triumphed 6-2, 6-3, 6-1 to become the first player in the Open era to win the same Major 10 times.
But in an astonishing resurgence the Mallorcan reached this year's Australian Open final, losing a classic to old sparring partner Roger Federer, and has steamrollered through the European claycourt season, winning a 10th title in Monte Carlo and Barcelona and a fifth in Madrid.
Nadal successfully held to move within touching distance of history, cruising through the final set by again holding throughout and earning three breaks to earn that 15th Grand Slam success. And he almost won the Australian Open, just falling short at the finish line to Roger Federer.
"This final to win La Decima for me is very, very special".
"I know Wawrinka is a very unsafe opponent, so my mentality was there all the time thinking that I can not give him the chance to be back in the match", the No. 4 seed explained.
"The feeling I have here is impossible to describe".
Nadal added in English: "I play my best at all events, but the feeling here is impossible to describe". "I didn't really think I'd have such a long career and win so many tournaments".
For me to be here for many years is hard to describe.
This time it has been hard for me, but my relationship with this tournament is special.
"I think it's something extremely remarkable that could be compared to the greatest achievements of any other, probably, athlete in any other sport". You're always going to be in my heart.
World No. 3 Wawrinka is a player of enormous pedigree and wonderful style, but even on his best day, he likely would have struggled to deal with Nadal.
"Rafa, I have nothing to say about today - you were too good", Wawrinka said during their trophy presentation. He puts this doubt in your head when you play against him.
The Spaniard has just claimed his TENTH French Open title, defeating Stan Wawrinka in this afternoon's final and he did so in typically imperious fashion.
It was also the first time since 1969 that the Roland Garros title decider had featured two men over 30.
From there, it was all downhill.
Nadal, who fired 27 winners, won all 12 service games, saving the lone break point he faced and making just 12 unforced errors.
It was then the final nail went into the coffin, despite it being only the second set.
Wawrinka, who spent almost five hours more on court than Nadal to reach the final, looked tentative and heavy-legged although he did have a glimmer in the third game when Nadal was forced to save a break point.
Wawrinka insisted a five-set semifinal win Friday over No. 1-ranked Andy Murray did not take anything out of him physically.
Nadal, who had taken the first set 6-2, broke early in the second and stretched his winning run of games to seven before Wawrinka managed to get on the board again.