Naoya Inoue vs. Ye Joon Kim results, highlights: 'The Monster' scores devastating KO vs. late replacement foe

Inoue took care of business on Friday in Japan to kick off what is expected to be a massive 2025

Despite facing a new opponent on less than two weeks' notice, undisputed junior featherweight Naoya Inoue's legendary power remained on full display on Friday morning. 

Inoue (29-0, 26 KOs), a four-division champion and Japanese superstar who is widely considered among the best pound-for-pound boxers in the sport, took his time in the opening rounds to feel out Ye Joon Kim (21-3-2, 13 KOs) before delivering the boom with a fourth-round knockout inside Tokyo's Ariake Arena. 

Kim, a 32-year-old native of South Korea, filled in on late notice to replace Australia's Sam Goodman, a mandatory challenger who twice pulled out of scheduled bouts against Inoue over the past two months due to a cut suffered in sparring.