DY, if he actually got a good coach and stopped playing a junior style of play in the pros, he'd be top 10 easily. No weapons on court, no good shot making, bad serve, headcase. So many problems with him. If he got a coach Instead of his parents, he'd be very good.
Querrey has a style to match that of players in the top 10, but he never used it to his full potential because he wasn't confident at all. Sock still has time and Harrison was always crap imo. Johnson is disappointing because if he fixed his BH he'd at least be top 15. Isner over achieved with his play style, so at least somebody fulfilled their potential to the max.
The new crop of players isn't looking too good besides maybe Tiafoe and Donaldson. Kozlov and Fritz are massive headcases, especially Kozlov who has one of the worst shots on tour (seriously where is his back swing lmao).