This might have been Thiem's second run to the French Open semifinals in as many years, but one suspects his quarter-final win over Novak Djokovic had taken something out of him mentally. By the third set of Nadal's 6-3 6-4 6-0 victory, he was a broken man.
"I started a little bit more nervous than normal," Nadal said afterwards, with his usual lack of hubris.
"But then I played well, I think. It's true that Dominic played with more mistakes than usual. His third set was not good.
"But at the same time it was windy out there, and he didn't play in the centre court before. Probably that was not helping him."
Nadal has never lost in the final in Paris, his only two defeats at Roland Garros coming at the earlier stages.
But then something will give tomorrow (New Zealand time), because the man he faces - Stan Wawrinka - has a 3-0 record in major finals.
Wawrinka and Thiem may share several stylistic tics - notably the flowing, single-armed backhand - but one is still a cub while the other has grown into a big beast these days.
Nadal, too, will need to bare his teeth tomorrow.