Baki the Grappler

One by one the world’s deadliest death row convicts come to Tokyo to get “a taste of defeat.” Finally, they meet face to face in the underground martial arts arena!

*Source: Media Do*

Toba and Igari start pro wrestling match immediately after the Maximum Tournament Saga.

Two chapters "Fake GaiA" and "Presidential Inauguration" published in the Weekly Shonen Champion Special Issue in December 17, 2009.

The boy asked the man, the man answered....."I've been there, in the Korakuen Arena, fought against Hanayama Kaoru, it was amazing." The boy asked him again but this time a question that terrified him to the core 'Where's the amusement park?" the man had no answer.

This is a series of illustrated tales about a dark place inside the world of the Baki series, the so-called "Amusement Park" come and discover by yourself why strong men fear it so much. Take a peek at darkness itself!!!

Another story in the Baki world, this series follows Kaoru Hanayama's story.

Spin-off series, written and illustrated by Yamauchi Yukinao, based on Hanayama Kaoru adventures in High school.

Baki Dangerous Zone is an 18 page tribute to the Baki the Grappler series. It was created by Sako Toshio as part of the series' 25th anniversary. 
Hanayama Kaoru and Hanma Yuujirou bet on a match between Jack Hanma and Katsumi Orochi. The gamble is presided over by Yakou Hikoichi.

This is a one-off remake of Grappler Baki's chapter 1, created in honour of Weekly Shounen Champion's 50th publication anniversary.

Joe Yabuki is a troubled young man who runs away from an orphanage. Wandering through the Tokyo slums, he meets former boxing trainer Danpei. Joe is later arrested and goes to a temporary jail where he fights Nishi, his future best friend, ​and leader of a group of hooligans. He and Nishi then go to a juvenile prison miles away from Tokyo. There Joe meets Rikiishi, a former boxing prodigy, and a rivalry develops between them. They face each other in a match in which Rikiishi dominates Joe until the latter hits him with a cross-counter, resulting in both being knocked out. This inspires the other prison inmates to take up boxing. Joe and Rikiishi vow to fight again.
(Source: Wikipedia)