Sakuno Ryuuzaki

The granddaughter of Sumire Ryuuzaki (the Seishun Academy tennis coach and math teacher). Sakuno is a kind, nice and quiet girl 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. She even received a Certificate of Commendation for ranking 3rd Place i…