Hajime Mizuki

Dominant Hand: Right Play Style: All-Rounder

St. Rudolph Gakuen 3rd Year student. He is the manager of the St. Rudolf Tennis Club. In the Prefectural Tournament, he was known as a data tennis playing like Inui.

He played against Fuji in Singles 2, and was cruelly beaten.This was because he angered Fuji's when he found out Mizuki had taught Fuji Yuuta, his younger brother, which could have broken his underdeveloped shoulders. It seems Fuji still holds a grudge, or has completely erased his existence as he shows he's forgotten who he was in episode 71.