"I'm expecting another five-set match", Zverev said.
Paris: Austrian Dominic Thiem destroyed a lacklustre and battle-weary Alexander Zverev 6-4, 6-2, 6-1 on Tuesday to reach the French Open semifinals for the third consecutive year. But he recovered to win the 4th set. But in their most recent, and arguably biggest match, in the Madrid final earlier this season it was Zverev who won, defeating Thiem 6-4 6-4 to win a third Masters 1000 title.
Play was suspended due to fading light, with Russian Daria Kasatkina leading 7-6 (5) 3-3 against second-seeded Caroline Wozniacki.
Thiem, the Austrian seventh seed, will face either 2016 champion and 12-time Major victor Novak Djokovic or Italy's world No. 72 Marco Cecchinato for a place in Sunday's final.
At world number 72, Cecchinato becomes the lowest-ranked man to reach the last eight in Paris since Latvian Ernests Gulbis (ranked 80) in 2008.
Thiem was knocked out by Djokovic in the last four in 2016 before losing to Rafael Nadal at the same stage previous year. "That's where I'm back", said the 2016 French Open champion. "It will be a pleasure to play against Novak".
It was the Serb's 200th Tour-level clay court match win. Meanwhile, Serena Williams and Venus Williams were bagelled in the deciding set as they were dumped out of the women's doubles at the French Open yesterday by third seeds Andreja Klepac and Maria Jose Martinez Sanchez.
The last Italian man to take part in a major semi-final was Corrado Barazzutti at the 1978 French Open.
Tiger settles for final-round 72 at Memorial
He was briefly tied for the lead Saturday until three-putt bogeys on the 16th and 18th holes, and he had to settle for a 68. Bryson DeChambeau finally got it right on his third try at the 18th hole and won the Memorial in a playoff on Sunday.
Kazakh Yulia Putintseva produced a clinical display to beat 26th seeded Czech Barbora Strycova 6-4 6-3 in exactly one hour and 30 minutes. She will now face compatriot Sloane Stephens for a place in the final.
The 23-year-old will next face U.S. Open runner-up Madison Keys. It's Zverev's first Grand Slam quarterfinal, and he got there by winning three consecutive five-set matches.
Men's fourth round: No. 1 Rafael Nadal beat Maximilian Marterer 6-3, 6-2, 7-6 (4); No. 3 Marin Cilic beat No. 18 Fabio Fognini 6-4, 6-1, 3-6, 6-7 (4), 6-3; No. 5 Juan Martin del Potro beat No. 9 John Isner 6-4, 6-4, 6-4; No. 11 Diego Schwartzman beat No. 6 Kevin Anderson 1-6, 2-6, 7-5, 7-6 (0), 6-2.
"The first two sets were fantastic, but then he raised his level and it was 50-50".
"At the end I was nervous". Unfortunately, it took me time to get well, and struggled with a little injury, as well, at the beginning.
Zverev and Thiem have always been identified as the two younger players most likely to threaten Rafael Nadal's dominance on clay.
American 13th seed Madison Keys also reached her first Roland Garros quarter-final with a 6-1, 6-4 win over Romania's Mihaela Buzarnescu.Keys, the US Open runner-up to Stephens past year, will face Kazakhstan's Yulia Putintseva for a place in the semi-finals, after the world number 98 saw off Barbora Strycova 6-4, 6-3.