Mensik was dragged from side to side once again and another catapulted Zverev forehand prompted him to throw his racquet across the court in desperation. The 20-year-old was seemingly always just off the pace.
Then the world No.27 showed why he is one of the most exciting prospects on tour; Mensik chipped two forehand drop shots to level up in the third. Raising his fist to the crowd, he was giving his all and rattled through the remaining three games to haul the world No.3 into a fourth set.
Just like countless times over the past decade, Zverev recalibrated, pressed the restart button and used all his Grand Slam experience to earn a 124th major victory to launch into his second Roland-Garros final.
Zverev becomes the fifth active player to hit multiple men’s singles finals in Paris, joining Novak Djokovic, Carlos Alcaraz, Casper Ruud and Stan Wawrinka.
“Playing this court is the toughest, but also the nicest in the world," he said. "You know that anything can happen at any given moment. You can always try to find a way.
“You have to fight for every point, you have to play every point like it’s your last. This is the special and fun thing about Roland-Garros.”