Andy Roddick 'convinced' Alexander Zverev will one day win Grand Slam

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Former world No. 1 Andy Roddick is "convinced" that Alexander Zverev will one daz win a Grand Slam. Zverev, ranked at No. 4 in the world, suffered a five-set defeat to Novak Djokovic in the US Open semiifnal. Last year, Zverev was up by two sets in the US Open final before Dominic Thiem created a stunning comeback.

"It might not be this week but I don’t think I’ve ever been more convinced that Zverev will win a slam. What a stand he just made... The level that game. Wow," Roddick tweeted.

Zverev left it all on the court

Djokovic, who is chasing a record 21st Grand Slam title, escaped with a 4-6 6-2 6-4 4-6 6-2 win.

"It was a great battle. Kind of a little bit disappointed with the start of the fifth set. To be honest, apart from that, it was a good match. I think we both left it all out there," Zverev said. "Yeah, I mean, the second break in the fifth set was so ridiculously unlucky that it sometimes happen.

But he's No. 1 in the world for a reason and he showed that tonight." Zverev has tipped Djokovic to beat Daniil Medvedev in the US Open final and collect a Calendar Grand Slam. "Yeah, I mean, I think it's great for the sport.

Nobody thought anybody will do it again, what Rod Laver did. To see him have the chance on Sunday, I do believe that he will do it is great. He's breaking every single record that there is," Zverev said. I"f you look at the stats, if you look the pure game of tennis action, he's the greatest of all time.

Nobody is there with him, because most weeks world No. 1, most Masters 1000s titles, most likely going to be the most Grand Slams at the end of the day. And he has the chance of winning all four in the same year. How do you compete with that?"