Baki the Grappler: Saidai Tournament-hen
A Sports and Combat Sports series from 2001 worth adding to your list.
Mitsunari Tokugawa, the organizer of the historic Tokugawa underground fighting ring, has created a tournament featuring 38 of the world's best fighters, many of whom are grandmasters in their respective form of martial arts. With the exception of weapons, anything goes in Tokugawa's ring so that each fighter is able to showcase their true power and strongest secret moves. Baki Hanma earned a place in the tournament due to his status as the reigning champion of Tokugawa's fighting ring. Will he be able to come out on top?
Plot summary from MyAnimeList. Data and images via Jikan API.