Hajime no Ippo: The Fighting! Episode 74: Mixup
Episode 74 of 75 of Hajime no Ippo: The Fighting!, aired March 20, 2002, 25 minutes. Available with English subtitles and dub where released.
Episode summary
A flashback shows how Sendo joined his gym. Ippo gets knocked down two times but when he gets up the fifth round gets more brutal. The fifth round ends and after that, the sixth round begins and is just as brutal as the last round.