Kiyosumi Sengoku

known as Lucky Sengoku, is a third year student, and is one of the keys to Yamabuki's strategy of finishing opposing teams off quickly. He is a happy-go-lucky guy with a strong tennis sense and extremely sharp eyes able to discern fast moving balls. His stronger weapons are the jumping serve, known as "Kohou (Tiger Cannon)" and the "Dunk Smash". He is known as a National level player, and was invited to the Junior Senbatsu (Junior Selection) training camp in his second year after Tezuka declined. Despite those honors, he suffered losses to both Momoshiro in the Prefectural tournament and Kamio in the Kanto tournament. In the anime, he leaves the Yamabuki team for a short while after those losses. He throws away his old style of tennis, trains in boxing, and forms "Boxing Tennis", which focuses on the three-minute limit in a boxing round. When he comes back to go to the camp to be chosen for the Goodwill Games between Japan and America, his new style, "Boxing Tennis", becomes a turning point in his style of play. He is voiced by Kōsuke Toriumi in the Japanese media and played by Masato Wada and Seiya (2nd season) in the musicals.