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.
"Unfortunately, he could get destroyed", Bresnik said.
Ken Rosewall, who won the title in 1953 and 1968, presented Nadal with the trophy.
As he sat down in the French Open lounge on Saturday, Günter Bresnik, Dominic Thiem's coach, was asked about Thiem's upcoming French Open final against Rafael Nadal, the finest clay court tennis player of all time.
After Thiem served, the trainer reappeared and massaged Nadal's forearm and wrist.
Play has since resumed and Nadal now leads 4-2 in the third set.
He broke again in the second game of the second set, which became a fairly routine affair. Its all square now in the first set, 2-2.
Change is coming in the men's game: Alexander Zverev is 21 and ranked No. 3 after winning the Masters 1000 title in Madrid and pushing Nadal hard in the Italian Open final.
Nadal won the first set 6-4. But after, the Spaniard was imperious.
Nadal won the second set in 53 minutes.
Thiem is contesting his first Grand Slam final.
But at 4-5 Thiem's serve let him down badly, handing Nadal three set points.
Thiem's serving and shot-making under pressure were among his principle weaknesses in losing the first set.
Nadal celebrated in relatively low key fashion, but then there is not much novelty value in this. Thiem makes his second double fault in the game.
Thiem, 24, is showing no signs of nerves in his first Grand Slam final.
The crowd cheered when Zidane was shown on the big screen.
"But the thing that doesn't change with Rafael Nadal is his point in, point out mentality and his consistency and professionalism". But against an opponent of Nadal's caliber, a lack of variance in his game plan proved crippling. He converted the second to make the score 2-1. Despite the expectation ahead of the final, the weather may prove the only victor on Sunday with heavy rain and thunder storms expected around 1500 (1300GMT) when the final is due to start.
But against Thiem, there was nothing wrong with Nadal's start. After guzzling water during his visit from the doctor, Nadal was back to playing his unmistakable brand of almost unbeatable clay-court tennis.
In contrast, there are eight women now younger than 28 who have been Grand Slam singles finalists.
They knocked out the top-seeded pair of Timea Babos and Kristina Mladenovic in the quarterfinals.
Nadal has been crowned the French Open champion an incredible 11 times, following successes in 2005, 2006, 2007, 2008, 2010, 2011, 2012, 2013, 2014 and 2017.
The Spanish world number one took his Roland Garros win-loss record to a jaw-dropping 86-2 as he captured his 17th Grand Slam title.
The victory also allowed the 32-year-old Spaniard to hold onto the No. 1 ranking.
The problem for the 24-year-old was that his serve wasn't co-operating.
He was the only man to beat Nadal on clay over the past two seasons, doing so twice. There is a slight chance of rain, but not until later in the afternoon after 5pm.
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