Sakuno Ryuzaki

Sakuno Ryūzaki (竜崎 桜乃, Ryūzaki Sakuno) is the granddaughter of Sumire Ryūzaki, the Seishun Academy tennis coach, and is one of the first characters who has direct contact with Ryoma Echizen

Sakuno is a kind, nice and quiet girl with very long hair kept in twin braids, who almost always seems to worry about Ryoma and the others. She started playing tennis after she saw Ryoma playing, and her progress differs in the anime from the manga; in the anime her lack of skill is a recurring gag, while in the manga she's good enough to be seen as a promising player and even a future regular.