If you're looking for manga similar to Seishun Smash, you might like these titles.
Moe is the youngest daughter of two tennis players who adopted her. When her father dies in an accident, she'll find the force to live thanks to her friend Sakuya and tennis.
Isami is great at sports, to the extent that she won a national middle school tennis championship. But her father and grandfather didn't approve of that as a future for her, so she quit tennis. It's around that time when the tennis school her grandfather owns goes bankrupt...
Naomi is a Space Tennis player who travels the universe with her family. She admires Sara, the "Queen of the Winds". She decides to participate in the Astro Open, where she can play against Sara if she wins. However, she is confronted by players who are controlled by the power of "darkness".......? Naomi will fight until the end to become the best Space Tennis player!
Nagahara Miu is the former genius tennis player who mysteriously quit playing tennis four years ago. But now, Miu, forced to play a doubles tennis team match with her classmate Issei, once again stands on the court...?!
Despite repeated rejections, Shinatsu fell in love at first sight with the most popular boy in school, Yoshiyuki-sempai (a member of the tennis club). After unhesitatingly joining the team, she gets rejected by her senpai. On top of that, she is bullied by his girlfriend. However, as her childhood friend Iku, says, "Things that are too easy to obtain aren't amusing at all." Right?