Rafael Nadal looks borderline unbeatable at the moment.
Nadal got off to the flawless start, breaking Thiem easily for a 2-0 lead but the Austrian quickly responded to level proceedings. But against an opponent of Nadal's caliber, a lack of variance in his game plan proved crippling. In the other semi-final, Marco Cecchinato's odd run in the last two weeks was ended by Dominic Thiem, also in straight sets, although the first two sets were somewhat closer than anything Del Potro could muster.
He hit a forehand long for 0-30 and then hit another forehand into the net to gift Nadal three set points.
The Spaniard continued his extraordinary domination at Roland Garros with a ruthless 6-4 6-3 6-2 victory.
But Thiem, unusually standing up to Nadal's first serve, forced two break points in the next game and converted the second with a flashing forehand into the right corner.
He admitted he was also close to quitting at 1-5 down in the second set.
The players, male or female, with the next highest number of singles titles at the same major are Martina Navratilova (9, Wimbledon), followed by Roger Federer (8, Wimbledon), Serena Williams (7, Australian Open and Wimbledon), Steffi Graf and Pete Sampras (7, both at Wimbledon), Federer and Novak Djokovic (6, both at the Australian Open), Graf and Bjorn Borg (6, both at the French Open) and Serena (6, US Open).
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The 10-time champion is playing Dominic Thiem. He persists at his punishing physicality and pounding shots even 13 long and grinding years after the wonder from the Spanish island of Mallorca debuted at Roland Garros with sleeveless shirts, clam-digger shorts, shoulder-length hair and MMA muscles, and, two days after his 19th birthday, won his first title and said, "I fight every point, every point, no?" The odds are also low for the player from Spain to win in straight sets.
They knocked out the top-seeded pair of Timea Babos and Kristina Mladenovic in the quarterfinals. Only Thiem's 2016 victory over Nadal in Buenos Aires was a success on non-quick clay.
And in 2012, he surpassed Borg's record to become the most successful player in French Open history with his seventh crown.
The world No. 1 wasn't as invincible this year - there may have been an injury issue - but he was still plenty good enough at the grand slam where he is virtually unbeatable.
The duo have met nine times throughout their career, all on clay, with Nadal taking six meetings to Thiem's three.
The top-seeded Nadal enters Sunday with a 10-0 record in title matches at Roland Garros and an overall career mark of 85-2 at the clay-court Grand Slam tournament.
The women's doubles final is also Sunday.