But if you think it's going to be a simple Sunday stroll for Nadal to get this 11th French Open title, consider that his opponent is a fitting foe on the final stage.
Rafael Nadal looks borderline unbeatable at the moment.
He reeled off the first six points for a 2-0 lead before Thiem settled and repaired the damage for 2-2.
He was serving in the fourth game when he went back to his chair and unwrapped strapping on his left wrist. He positioned himself on the baseline, hitting his returns early to minimise Nadal's reaction time.
Cecchinato's match-winning performance against Novak Djokovic this week is probably the finest tie-break ever played on clay, as Aussie doubles great Peter McNamara suggested when he tweeted immediately afterwards that it had showcased all the finest qualities of clay court tennis.
However, Djokovic levelled at 2-2 and then survived two break points - and a 30-stroke rally - in the seventh game.
Whatever the problem, his dominance remained and a love game took him to 4-2 before he eventually sealed victory on a fifth match point when the Austrian fired another backhand long.
Rafael Nadal will play against Juan Martin Del Potro, while Dominic Thiem takes on the Italian surprise Marco Checchinato.
Thiem dug in - especially in the roughly 13-minute sixth game - but he crumbled attempting to stay in the set, making four unforced errors.
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However, during the treatment Nadal revealed that he was concerned about whether he was going to be able to continue.
He admitted he was also close to quitting at 1-5 down in the second set.
Ranked 72, Cecchinato is the lowest-ranked player to reach the semis of French Open since 1999 - when Andrei Medvedev of Ukraine went on to reach the finals, only to be defeated by Andre Agassi. "Against Dominic Thiem, he is top 10, and today, all the people were for me".
He won his first ATP title in April 2018 at the Hungary Open in Budapest, beating John Millman of Australia in the summit clash.
The No. 6-seeded pairing from the Czech Republic beat Eri Hozumi and Makoto Ninomiya of Japan 6-3, 6-3 on Sunday.
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 32-year-old Spaniard is also vying for his 17th major trophy, which would move him within three of Roger Federer.
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. Thiem, 24, is the only player to beat Nadal on clay in the past two years. There is a slight chance of rain, but not until later in the afternoon after 5pm.