UWFi was formed in 1984 by Akira Maeda, Yoshiaki Fujiwara and other New Japan defectors where Go would team with Rusher Kimura.

Go would return to the States in 1986 working for American Wrestling Association (AWA) as the Super Ninja.

Later that year in the AWA, he changed his name to Mister Go teaming with Shunji Takano as the Super Ninja.

[6] Their relationship, however, was often strained, due to the fact that Yagi kept what money he earned from wrestling for himself, meaning his wife had to work full time to provide for their children.

[6] Yagi was arrested on suspicion of theft at the west exit of JR Shinjuku Station on January 15, 2003, after reportedly snatching a wallet containing around ¥22,000 from a 69 year-old woman and attempting to flee.

[7] Yagi, who was working in an office at the time of his arrest, denied the crime and claimed he was returning the wallet to the woman after she had dropped it.

[8][9] Yagi's wife was the chief mourner at his funeral, held on October 19 and attended by over thirty wrestlers, including Animal Hamaguchi, who spoke.