LONDON—World No. 3 Alexander Zverev is a world-class prognosticator.

Zverev, who qualified for both the ATP World Tour Finals and the #NextGenATP Finals, said he not only predicted Hyeon Chung would capture his first career title at the inaugural tournament in Milan, he also forecast the South Korean No. 1 would go undefeated in the process.

More: Zverev Roars Past Cilic

Chung fulfilled Zverev’s prediction defeating Andrey Rublev in the final.

“I've made this call with my team,” Zverev told the media after his 6-4, 3-6, 6-4 win over Marin Cilic in his World Tour Finals debut. “We had a little bit of a quiz who is going to win the tournament. I said Chung, and he's not going to lose a match. I actually said that. Quite surprisingly.”

The 20-year-old German watched the tournament on television and said he was pleased by what he saw.

“Look, I think it was a great event,” Zverev said. “I think the ATP did a great job. I think the crowd enjoyed it. I mean, it was packed I think most of the days. That just shows how big of a success and how interesting the young guys are.”

While Zverev did not pick a winner for this week's World Tour Finals, he calls six-time champion Roger Federer, his opponent tomorrow night, the tournament favorite. 

"I think anyone beating Federer in this group has a good chance of passing," Zverev said. "But he's the favorite definitely in all of the matches he plays. I played him a few times this year now.

"I played him three times, if you count the Hopman Cup match we played. Obviously, all of them were great matches. Hopefully it can be another one."

Photo credit: Matthew Stockman/Getty