[2] He competed in the Bantamweight[3] and Featherweight divisions.
Sakamoto is a longtime Shooto and Vale Tudo Japan veteran and currently serves as a representative and promoter for Shooto and Vale Tudo Japan.
Sakamoto trained in amateur wrestling before becoming a trainee under Satoru Sayama at the Super Tiger Gym.
He was a frequent opponent of Kenichi Tanaka, another Sayama trainee whom he fought and eventually captured the Shooto Lightweight 65 kg (143.3 lb) Championship from.
He is now a head trainer at Shooting Gym Tokyo.