The Austrian seventh seed, the last man to beat claycourt master Rafa Nadal on his favorite surface, displayed an impressive arsenal of weapons in the first two sets before regaining his composure after the loss of the third.
Kazakhstan's Yulia Putintseva celebrates winning her fourth round match of the French Open.
"Zverev has time to recover physically but at some point you get exhausted mentally". While Zverev batted away questions about whether a third five-set match would start to take its toll, there is no doubt that Thiem in a best-of-five is not going to be easy - he should expect either four or five sets for sure.
In the second game of the second set, she was convinced an incorrect call went in favor of Keys and asked the chair umpire to come down and check it. "I'm very happy about being in the quarterfinals here going the hard way, going the long distance. showing everybody that I can play for as long as I need to".
"But I hope I can win more matches here". The German also suffered 42 unforced errors, compared to Thiem's 20.
He followed up a wickedly spinning sublime backhand drop with another rasping one-handed backhand victor after saving a break point to lead 5-1 and sealing a crushing win with a straightforward backhand into an open court. Sunday evening she rallied from 5-3 down in the first set, which lasted 68 minutes.
Djokovic faced an unfamiliar opponent in 72nd-ranked Cecchinato, who was cleared of a match-fixing charge on a technicality in 2016 - the year Djokovic won the last of his 12 majors at Roland Garros.More news: Giuliani: Kim Jong-un 'begged' for summit to take place
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I hope this is not the end here.
The second-set tiebreaker was scrappy, Zverev clinching it with an ace to level the match.
"I didn't win it today, but it's a positive sign", said Khachanov.
In the simultaneous women's quarter-final on Suzanne-Lenglen, Madison Keys reached the semi-finals of the French Open for the first time in her career.
In the women's quarterfinals, No. 10 Sloane Stephens beat No. 14 Daria Kasatkina of Russian Federation 6-3, 6-1, and No. 13 Madison Keys eliminated unseeded Yulia Putintseva of Kazakhstan 7-6 (5), 6-4. She will now face compatriot Sloane Stephens for a place in the final. "It's going to be an incredible challenge for me", Thiem said.
The world No. 3 keeps surprising his audiences, but not as much as Italy's Marco Cecchinato, who shocked eighth seed David Goffin 7-5, 4-6, 6-0, 6-3.
His win over No. 19 seed Nishikori was surprisingly one-sided at times, particularly as he collected a bagel win in the second set, where the Japanese star's serve was nearly completely nullified by the advancing athlete.
She clinched the victory on her first match point with a forehand victor to reach the last four at Roland Garros for the first time.