[3] Sudo, following his retirement, transitioned into a career in entertainment as a Japanese singer, composer,[4] choreographer, actor, professional calligrapher and author.

In 1998, after graduating, Genki moved to the United States and enrolled in Santa Monica College, but dropped out soon after.

Around this time, he joined the Beverly Hills Jiu-Jitsu Club and practiced Brazilian Jiu Jitsu.

Then he moved to japanese promotion Pancrase, defeating Kosei Kubota by unanimous decision in his first fight.

One entrance featured Sudo doing the robot and operating levers that released a column of smoke from the top of his head while wearing a Kentucky Fried Chicken bucket as a hat and a white plastic mask, in an homage to the musician Buckethead.

On 21 December 2001, Sudo fought against Kenichi Yamamoto at Yokohama Cultural Gymnasium, and won by Rear Naked Choke.

Making his entrance in a kimono and a tengu mask, Sudo showed his personal style by dancing and throwing spin kicks to open the match, eventually launching a flying triangle choke attempt which lasted for most of the round.

At the second round, Genki threw Remedios with a hip throw and locked a rear naked choke, making him tap out.

However, despite his initial domination, the Japanese started receiving damage while standing, failing in a rolling kneebar and several takedown attempts.

He dominated the end of the fight landing hurtful shots on Sudo to win a split decision.

[10] Prior to his retirement on New Year's Eve Sudo fought for K-1 HERO's, the mixed martial arts branch of the most popular Japanese combat sports circuit.

[11] On 8 April 2010 he received his black belt in Brazilian Jiu-Jitsu under Naoyoshi Watanabe at Triforce Academy.

A fighter with unorthodox striking and grappling ability, he has won fights by flashy knockout in both mixed martial arts and kickboxing.