0937 GMT January 19, 2020
The Spaniard, 31, won 6-2, 6-3, 6-1 to secure 'La Decima' at Roland Garros, and his 15th major title, BBC reported.
Nadal - who won without dropping a set in the tournament for the third time - said he could not have imagined such success when he first won 12 years ago.
"In 2005, I thought in 2017 I'd be fishing on my boat in Mallorca." Nadal said.
He added: "I didn't really think I'd have such a long career and win so many tournaments."
Nadal swept through the final in two hours and five minutes to extend his all-time lead at Roland Garros, with 10 titles to Bjorn Borg's six in the open era.
He said: "This tournament has been very special to me, and it's true that it is unprecedented.
"Trust me, I'm very happy that I'm the one who did it.
"If I can do it, someone else can do it.
"But you need the right circumstances, the right ingredients to win 10 French Open titles.
"I don't know if I will ever get to meet the player who will do better than I did."
‘The best Nadal has ever played’
Nadal has struggled for form and fitness since his last Grand Slam title at the French Open three years ago, but has enjoyed a resurgence this year.
Wawrinka had been expected to pose the first serious examination of Nadal's new-found confidence but he was brushed aside like the previous six opponents.
"For sure he's playing the best he's ever played," said the Swiss.
"But not only here. I think since the beginning of the year, you can see he's playing more aggressive, staying more close from the line.
"That's clearly the best he ever played. That's why he's winning so much again."
Famously slow between points, Nadal moved forward at every opportunity once the action began and, comfortably finishing points at the net, made it through each match at Roland Garros after an average one hour and 44 minutes.
Wawrinka, on the other hand, needed two-and-a-half hours per match.
"If you play Rafa, if you're not completely free with what you think and what you're going to do, and not completely relaxed the way you're going to play, you have no chance," said the Swiss.