Dominic Thiem will face Stefanos Tsitsipas in a clash of first-time ATP Finals finalists.
Alexander Zverev says it's a prelude of major happenings to come in 2020.
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The 2018 ATP Finals champion predicts we will see a maiden Grand Slam champion next season.
"I think next year will bring a new Grand Slam champion," Zverev told the media in London after bowing to Thiem at the ATP Finals. "We'll see who that will be, because I think the young guys are playing incredible tennis.
"You know, it can be Daniil [Medvedev], it can be Stefanos, it can be Dominic. I'm in the mix, as well, I hope. We'll see what next year brings. But I think for the young guys, it's going to be an exciting year."
World No. 1 Rafael Nadal and second-ranked Novak Djokovic split the Grand Slam spoils this season. The Big 3 of Nadal, Djokovic and Roger Federer have combined to claim 12 consecutive major championships.
The last man to win a maiden major was 2014 US Open champion Marin Cilic.
Thiem is a two-time Roland Garros runner-up, while Medvedev pushed 12-time Roland Garros champion Nadal to five sets in his maiden major final at the US Open in September.
Zverev, whose best Grand Slam results are successive French Open quarterfinal appearances, is aiming to improve his major results next season.
"To finish the year No. 7 in the world, for me, with all the things that happened to me and with all the things that were happening is actually quite incredible," Zverev said. "I didn't think I would. In that point, you can see it in a very positive way.
"And the other point, of course, I was very disappointing, because I wanted to win more tournaments. I wanted to play better at the big tournaments. Actually, after the US Open I started playing much, much better. I hope I can take that into next season, and we will see."
Photo credit: Christopher Levy