Top-seeded Roger Federer had to work for it, but he ultimately beat Frenchman Gilles Simon on Friday to advance to the semifinals at the Swiss Indoors Basel in Switzerland.
His ninth title at his hometown event, where he was once a ball boy, has now matched the nine he won at the Halle grasscourt event in Germany.
It is Zverev's 52nd win of the season and a ninth semi-final spot for the world number five, who has already qualified for the season-ending ATP Finals in London next month.
The Swiss great, who had to recover from a slow start to beat Jan-Lennard Struff a day earlier, stretched his winning streak at his home-town tournament to 18 with a 7-6 (7-1) 4-6 6-4 triumph.
"For those who do not speak such good German and Swiss-German, thank you very much for coming", he said.
"I'm always happy when I win, I'm happy I fought through like this", said Federer after the victory.
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After tamely surrendering the first set in 20 minutes, Medvedev found himself trailing 5-1 in the second but managed to fend off a match point and hold serve.
"I'm starting to really get to understand the conditions and it was consistent, my most consistent match by far".
He will be the third seed in Paris and has a bye into round two, where he will face Croatia's world number six Marin Cilic.
It's the second final of the year for Copil.
Anderson was runner-up to Djokovic at Wimbledon this year but the win in Vienna represented the biggest title of his career.
The second set produced five breaks of serve - only two to Federer - before Simon struck the victor. He kept his foot on the pedal in the second, racing to a comfortable 4-0 lead but had to fight to emerge the victor. But he finally lost his nerve in the 12th game when two unforced errors in a row handed Federer the match.