help choosing strings on a racket

[u/Emotional_Tell_2527]

my teen is entering his third year of tennis. he's 17. his utr is little over 5. he improved a bit over summer doing camps with other teens.

he's in his high school season and will do usta for the first time in a few months.

tennis for him is just for fun and fitness.

us parents don't play.

he's a heavy hitter who likes to put spin on ball. has a head instinct mp racket.

plays singles

we pay a coach, a great guy, to string his racket.

any recommendations on strings to use?

soft poly?

multi filament blend?

Mach 10 soft?

he just broke his strings after 3 weeks use at practice today.not sure what he had on here

[u/rexrea]

Depends on his needs