Where is the next young champion?

All recent Major Champions like Federer, Nadal, Djokovic, Sampras, Hewitt etc all won their first in their early 20s. As Federer, Nadal and Djokovic now move to mid 20s and beyond, where is the next guy to take their place? I can't think of any who will challenge the top 4 of today for quite some time.

Lorus welcome back to Tennis.

You may want to take a look at

https://www.606v2.com/t21652-where-are-the-rising-young-stars

Excellent point by lorus. I think young Raonic and harrison have the best chances of being the next grandslam stars. Harrison has a very polished all around game and a good forehand and serve as his bread and butter. Raonic has the big serve and is also very comfortable at net. I would be surprised if one of these two didn't win a slam. Tomic also should be included in this group. I think all three of them are about 2-3 years away from challenging the current starts.