3rd Year Student Birthdate: June 3rd Zodiac: Gemini Class: 3-11 Relatives: Mother; Father Play Style: Data Tennis, Serve and Volley Dominant Hand: Right Special Moves: Data Tennis, Quick serve Height: 184cm or about 6"1' Blood Type: AB Favorite Shoes: Puma (SEQUENCE PTO636 0067) Favorite Racket: Prince (GRAPHITE CHALLENGE) Favorite Subject: Physics Favorite Color: Black Favorite Food: Durian according to Momoshiro, Italian soup noodles according to Eiji Hobby: Gathering data, making juices, making his glasses reflect light Preferred Type: Someone calm. Someone that is older. Father's Occupation: Office worker

Sadaharu Inui is a 3rd-year student and regular member of the Seigaku tennis team. He is an intelligent player and is best known for collecting player data, which he incorporates into a unique playing style known as "Data Tennis".

(Source: Kuryujiru LJ and Prince of Tennis Wikia)