They are both sports related. Also they are both light and fluffy, without too much drama. It mainly takes place at a school, but TPOT is in a high school setting and CB is at a university. While CB has romance, TPOT doesn’t.
The Racket Boys is similar to The Prince of Tennis because both dramas feature a group of boys trying to improve in a certain sport.
both about school but one is set in high school and the other is set in college. about the lives of the players within and without the team