Height: 167 cm
Play Style: Counter Puncher
Dominant Hand: Right
Special Moves: Tsubame Gaeshi, Higuma Otoshi, Hakugei (Triple Counter)

Shuusuke Fuji is a third year student at Seishun Academy. He is given the title of genius due to his tactical skill on the tennis court. Fuji is cheerful and easygoing, with a penchant for playfully teasing those around him. He is the middle child of the Fuji family. His unnamed father is a foreign-based employee, and is never seen in the series. His mother, 49-year-old Yoshiko, who also has perpetually-closed eyes, is seen in the manga as a kind and dedicated Japanese housewife. His younger brother, Yuuta, is a tennis player at St. Rudolph Middle School. Fuji's older sister, 24-year-old Yumiko, is considered very attractive and is popular among both Fuji and Yuuta's friends. He grew up in Chiba, where he became friends with Kojirou Saeki, the current vice-captain of Rokkaku Middle School Tennis Club. Later on, he moved to Tokyo and entered Seigaku. Fuji usually takes the position of S2 (Singles 2), although sometimes he is paired with Takashi Kawamura or Eiji Kikumaru in Doubles (with Eiji, they are called the "Dream Pair"). Also, he and Ryoma Echizen temporarily take turns for the position of S1 (Singles 1) when captain Kunimitsu Tezuka is in rehabilitation.