Dragon Ball GT (1996)

S6E8 A Fistful of Pride

The separated spouse of a faded boxer comes back to Gloribee seeking custody of their sole child. In need of fast money for his legal expenses, the boxer takes on the Frisco Kid, a rising star in the boxing world, and manages to win. However, he soon realizes that the match was rigged by the Kid's unscrupulous manager and his accomplice, who orchestrated the fight to profit from side bets.