24-year-old Zverev saved three set points at 4-5 in the second set and then won nine of the next 11 games to get past Djere. Zverev struck 31 winners and converted seven of 10 break points for victory.
Zverev has been in excellent form in the buildup to the clay-court major. He is among the top contenders in Paris following his title in Madrid, where he beat Rafael Nadal.
The inevitable question remains - can Nadal beat the odds, once again, to lift an unprecedented 14th on la terre battue?
The World No. 6 earned 11 break points and broke serve on three occasions to snap a four-match losing streak against Thiem.
The top-seeded Zverev, who won the tournament in 2017 and 2018, hit six aces, saved three of the five break points he faced and converted five of his own against his 89th-ranked opponent.
The earthquake lasted for around 10 seconds as the camera shook wildly, as Zverev and Koepfer played, unfazed.
It wasn't the day's only upset in Rotterdam, with third-seeded Alexander Zverev also losing.
He dropped the opening set against Alexander Zverev, one of the young guys trying to shove aside Djokovic and the rest of the Big Three.
Top-ranked Djokovic set up a match against Dominic Thiem on Saturday as he goes for a record-tying sixth title.
Alexander Zverev kept his tournament hopes alive with a 6-3, 4-6, 6-3 victory over Diego Schwartzman on Wednesday at the season-ending ATP Finals.
Medvedev prevailed 6-3, 6-4, while Djokovic cruised past Finals debutant Diego Schwartzman 6-3, 6-2 in an empty O2 Arena.
The German tennis player gave a more detailed denial of domestic abuse allegations made by a former girlfriend,
The third-seeded Russian secured just his second win against the fourth-seeded Zverev in seven matches, and his previous victory against the imposing German was also in a Masters final last year in Shanghai.
Alexander Zverev advanced to the Paris Masters final for the first time by beating top-seeded Rafael Nadal 6-4, 7-5 on Saturday, denying Nadal the chance to win a tournament that continues to elude him.
The 23-year-old German tennis player was responding to the domestic abuse allegation made by his former girlfriend Olga Sharypova.
Zverev hit nine aces, saved the only break point he faced and converted five of his own to beat the French Open semifinalist. The first set was over in 38 minutes, the second in just 33.
Top-seeded Alexander Zverev defeated Adrian Mannarino 6-4, 6-7 (5), 6-4 to reach the Cologne Championship last-four on Friday.
Zverev has had a breakthrough year in Grand Slam tournaments with his first semifinal at the Australian Open in January and first final at the U.S. Open last month, when he lost to Dominic Thiem
Zverev was playing indoors for the first time this year after a mixed record on indoor hard courts in 2019. He has been strong in those conditions in the past with three career indoor titles, including the 2018 ATP Finals.
Pulling the No. 6 seed this way and that with his precision groundstrokes, the 75th-ranked Sinner is the first debutant to reach the men's quarterfinals since Rafael Nadal, who'll be his next opponent.
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