Ring ni Kakero 2 (2000)

At the end of Ring ni Kakero 1, Ryuji Takane went up against "Superstar" Jun Kenzaki for the World Title. Now, 17 years later, Rindo Kenzaki, the son of Jun Kenzaki and nephew of Ryuji Takane, lives with Ishimatsu Katori, the "Kenka Champion" from Ryuji and Jun’s time. Rindo will meet up with a new generation of boxers to create a new Golden Japan Jr. to take on the world.

Source: www.anisearch.com/manga/3129