Trained in Wing Chun as a youth, Sefo developed his style fighting Muay Thai under Thai legend Kiosot, with an impressive unbeaten record as an amateur and as professional in the Oceania league.

Holding five world title belts, Sefo is well respected in the professional fighting community, having been invited to compete in the prestigious K-1 events and holds an impressive record in the K-1 World Grand Prix events and maintains the highest KO ratio in the K-1.

Sefo is particularly known for being able to take (and dish out) a tremendous amount of punishment. At times he will taunt his opponents by letting his hands and his guard down completely and inviting them to hit him repeatedly. Some enjoy his antics but others find them akin to showboating. Nevertheless his peers respect him, other fighters consider him an aggressive and competitive fighter but only in the ring.

He excels at fast and hard combinations from all angles, often employing uppercuts to get through the opponents defence, lastly he is known for devastating and painful kicks including lowkicks and kicks to the face.

Sefo is considered one of the very best K-1 fighters to never win the title, Jérôme Le Banner (who was defeated by Sefo once) being another. In the K-1 organization Sefo has fought some of the best and/or most well known names including Ernesto Hoost, Semmy Schilt, Remy Bonjasky, Peter Aerts -all (former) World Champions and many others including Bob Sapp.