Kaoru Kaidoh

Kaidoh is nicknamed "the sniper" by his fellow teammates since he is always really serious and is easily irritable. Kaidoh's famous move is the "boomrang snake" which makes the tennis ball go around the pole and back into the court. Kaidoh trains extremely hard, most of the time under Inui's instructions in order to improve his tennis skills. (additional note: he lost to Echizen in the first Seigaku regular selection matches, but he was able to save his regular's position after defeating Inui)

Takeshi Momoshiro

Momoshiro Takeshi perfers to be called "Momo-Chan" (chan is a suffix used on Japanese names, usually refers to a really close friend or a kid) Momo is the power house of Seigaku, he plays really powerful balls and his "dunk smash" is beyond regular Junior high tennis level. Momo-chan is also the first Seigaku player to meet the star of the show: Echizen Ryoma, afterwards, the two behind good friends.

Takashi Kawamura

Kawamura's special feature is that he's in fact a really timid person who changes drastically when he's playing tennis. Kawamura used to tennis and often plays doubles with Fuji in the games.

Sadaharu Inui

The brain behind Seigaku's team. He takes data for all the games, including personal data for his rivals along with teammates. He's formerly known as Seigaku number 3 (right behind Fuji and Tezuka) - the data tennis man. But due to losing the Seigaku's regular selection matches in the beginning of the series (mostly because of Ryoma's appearance), he played Seigaku's manager for the first 50 or so episodes.

Eiji Kikumaru

Eiji is perhaps the most popular character in this anime. He's well known for his acrobatic play, together with Oishi, they are known as Seigaku's golden pair. Eiji has a big teddy bear at home and when it falls, it's always towards left. Eiji was able to use this as a game strategy with Oishi in one game. Eiji has a terrific personality although he loves to tease others as well, this got Oishi, who is a really sensitive person really mad in one occasion and caused the biggest crisis of Seigaku - the breaking up of the golden pair.