bjk
Hall of Fame
Looking at some of the biggest Nextgen players, like Tsitsipas, Kchachanov, Zverev, Coric, Kozlov, there is no power. Zverev and Kchachanov and Tsitsipas are 6'6 but don't play like it at all and in fact are clay court players. The biggest hitters are probably Rublev and maybe Donaldson and Tiafoe. (Opelka doesn't count).
So the reason for this lack of power is that a) most players develop on clay and b) they all hit with southwestern grips or worse. The only eastern grip in the group is Rublev and he happens to be the biggest hitter. The problem with the spinny grips is that it optimizes too early. It's good for winning junior tournaments but as players get older and reach the ATP they need power more than control. A good example of the dangers of too much spin is Jack Sock, who can't dominate anybody with his forehand because he can't generate enough pace. The older generation like Berdych, Fed, Gonzalez, Delpo, and Cilic have much more powerful forehands for the simple reason that they hit flatter.
Of course the Nextgen is actually doing better than the Dimitrov/Nishikori generation but that's because they are peaking young. As these young players get older they will start to decline faster because players like Zverev won't be able to sustain 49 shot rallies like his matchpoint rally vs. Gasquet. If you are 6'6 and 20 years old and can't overpower Gasquet, you may peak early and start to break down much faster.
So the reason for this lack of power is that a) most players develop on clay and b) they all hit with southwestern grips or worse. The only eastern grip in the group is Rublev and he happens to be the biggest hitter. The problem with the spinny grips is that it optimizes too early. It's good for winning junior tournaments but as players get older and reach the ATP they need power more than control. A good example of the dangers of too much spin is Jack Sock, who can't dominate anybody with his forehand because he can't generate enough pace. The older generation like Berdych, Fed, Gonzalez, Delpo, and Cilic have much more powerful forehands for the simple reason that they hit flatter.
Of course the Nextgen is actually doing better than the Dimitrov/Nishikori generation but that's because they are peaking young. As these young players get older they will start to decline faster because players like Zverev won't be able to sustain 49 shot rallies like his matchpoint rally vs. Gasquet. If you are 6'6 and 20 years old and can't overpower Gasquet, you may peak early and start to break down much faster.