Over the past two years, including best-of-three matches, the Spaniard is 49-2 at clay tournaments.
He didn't stop there, such was his extended praise for the recently turned 32-year-old.
"But I believe I will be ready for the final."World number one Nadal went into Friday's clash with a 9-5 career record against Del Potro, including all three meetings on clay.However, it was Del Potro who was in the ascendancy in the rallies in the first set".
For example, losers in this year's first round left Paris with €40,000 - a 12.5 per cent jump on last year's €35,000.
Yet Bresnik obviously isn't throwing in the towel.
Cecchinato, who up until this year's Roland Garros never got past the first round of a Grand Slam event, did not look the same in the third set, as he hit just one victor, committing eight unforced errors.
Cecchinato had never won a Grand Slam match before this year's Roland Garros but made the semis with a string of stunning wins.
So what will he need to do to counter the credible threat of Thiem, the only man to beat him on clay this year, on Sunday?
He probably felt as though he had been, as Nadal completed a devastating 6-4 6-1 6-2 victory.
The second set proved particularly tough before the dominance of the seventh seed eventually told against a player who had stunned Serbia's Novak Djokovic in the quarter-finals.
Prevailing on Nadal's favourite court in Paris over five sets will be far harder, however.
"But I have a plan".
And the underdog soon faded as Thiem kicked on, racing to two swift breaks in the third and rescuing two break points to serve out the match in style. "It's definitely one of the best things somebody ever achieved in sport".
Nadal's record at Roland Garros now stands at 85 wins and two defeats. "He has the power".
On the other hand, del Potro also was involved in a rain-marred quarter-final against third seed Marin Cilic over the last two days. Nadal had more trouble with another Argentine, the diminutive Diego Schwartzman, in the quarterfinals.
On the thirteenth day of the tournament held in France's capital, Paris, Nadal, world number 1, and No. 5 seeded Argentinean Del Potro met in the semi-finals. Or at least not a blowout. The Austrian won just one of the first nine points as Nadal immediately broke for 2-0. He has undergone four wrist surgeries but the issue, thankfully, was a minor hip complaint.
"Today, all day, on Philippe Chatrier, the fans said "Forza, Marco", so I think this is the best moment for me", said Cecchinato."Against Dominic Thiem, he is top 10, and today all the people were for me".
"In every game that I served, I had problems".
Del Potro had required the doctor early in the first set after appearing to jar his ankle in the red clay.
And on the penultimate point of the semifinal, after being run ragged, the 2009 US Open victor could only offer up a smile.
That's only €100,000 more - just a 4.5 per cent rise - than last year's champions Rafael Nadal and Jelena Ostapenko collected. He impressively recovered from a slow start to make the first set close.
"If I'd won the second set I think it is totally different, the third set", he said.
The 16th-seeded Gauff, who is 14 years old, beat 15th-seeded Leylah Annie Fernandez of Canada 6-4, 6-3.
Leading the tiebreak 6-3, he was powerless as Cecchinato claimed the following four points to earn the first of three set points.