There are few who would question Demetrious Johnson’s claim as the best flyweight in MMA history.

Wednesday, he can put a bow on that status – or an underdog champion could play the role of spoiler.

ONE Championship kicks off the most prolific month in its history this week with the first of four straight events on TNT. In the ONE on TNT 1 main event, flyweight champion Adriano Moraes (18-3) puts his title on the line against longtime UFC champion and challenger Johnson (30-3-1).

Johnson spent years in the UFC, where he won the flyweight title in 2012 and defended it 11 straight times over more than five years. He was a nine-time bonus winner in the UFC and broke the record for most consecutive title defenses. He lost the title to Henry Cejudo in a close fight in which nearly half the media outlets tracked by MMA Decisions scored the bout in his favor.

A win over Moraes as a -650 betting favorite would come after three wins in 2019 in ONE’s flyweight tournament – and it would leave little doubt to anyone that “Mighty Mouse” can lay claim to the status of best 125-pounder in history.

Ahead of his title shot on TNT, ONE Championship gave us an inside look at what life is like for the GOAT when he’s not fighting – and often, that means playing the daddy role.

Check out ONE’s “Anatomy of the GOAT” special in the video above. Then don’t miss Wednesday’s event on TNT, which also includes a key welterweight bout between Eddie Alvarez and Iuri Lapicus.