Thiem broke back immediately as he continued to go for his shots, and he saw off a break point to hold for 2-2. He dropped serve in the third and Nadal held for 3-1 after taking a time out because of a sore hand. He removed the tape from his left wrist and seemed to take a tablet.
"Unfortunately, he could get destroyed", Bresnik said.
With the two heavy favourites in the semi-finals winning, we have the final that most people during the latter stages would have wanted, Nadal v Thiem, and before I discuss the data in detail, I wanted to talk about their previous meetings a little more. In Madrid, Thiem said the key was to be positive against Nadal.
Why? Nadal was 95-0 when capturing the opener on clay in the best of five format. Its all square now in the first set, 2-2.
Nadal now leads 2-0 in the second set, having won the first set 6-4. He is the only man to beat the world number one on clay in the last two years - in Madrid this spring and in Rome last year. Its neck-in-neck in the first game.
The problem for the 24-year-old was that his serve wasn't co-operating. Serving at less than 50%, Nadal got plenty of looks at second serves.
Thiem was still on the back foot in the third set, being forced to save four break points in the first game.
Spain's Rafael Nadal celebrates after victory over Austria's Dominic Thiem during their men's singles final match on day fifteen of The Roland Garros 2018 French Open tennis tournament in Paris on June 10, 2018.
His lone opportunity of the set indeed vanished.
But Thiem showed resilience in getting two break points on Nadal's serve.
Nadal called it "not even a dream" to gather 11 titles in Paris, saying it was "impossible to think of something like this". He removed the tape from his left wrist - the Mallorcan suffered a wrist injury that ruled him out in the first week of the 2016 edition - and the trainer came out again at 3-2. Nadal appeared to take more tablets.
Yet he just wouldn't be denied.