Baki the Grappler S01 E21 An Unlikely Challenger

Yujiro Hanma shows up after Baki's fight and knocks him out, and Doppo Orochi challenges Yujiro to a fight. After watching Doppo spar with his students, Baki spars with him. Yujiro starts a fight with a group of boxers at their gym, and he fights with Izou Motobe and Baki's next opponent is revealed.