Undisputed world junior featherweight champion Naoya Inoue stormed to a predictable fourth-round knockout win over late replacement opponent Ye-Joon Kim on Friday, to set up a fight in the United States next.

The Monster' set for Las Vegas showdown after Ye Joon Kim knockout - Undisputed super-bantamweight world champion set for first US bout in almost four years in the spring

Japan's unbeaten Naoya Inoue said he was mentally "exhausted" after knocking out a goading Kim Ye-joon to retain his undisputed world super-bantamweight titles in Tokyo on Friday night. Inoue is expected to take his prodigious skills to Las Vegas for his next fight,