Naoya Inoue made quick work of late-replacement Ye Joon Kim, stopping him in the fourth round to remain the undisputed junior featherweight champion on Friday at the Ariake Arena in Tokyo, Japan. Kim gave a spirited effort,

Follow along for round-by-round updates as Naoya Inoue puts his undisputed crown on the line against Ye Joon Kim.

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.

Here's all you need to know ahead of Naoya Inoue's undisputed junior featherweight title defense against late replacement Ye Joon Kim on Friday.

Earlier today in Tokyo, Japan, unified 122 pound king Naoya Inoue scored yet another impressive highlight reel KO. Facing late sub Ye Joon Kim, "The Monster"

The Japanese star kept hold of his super-bantamweight belts with a fourth-round stoppage of Kim, who stepped in for the injured Sam Goodman

Naoya Inoue takes out Ye Joon Kim with one brutal right hand in the fourth round before outlining future plans

Naoya Inoue's barrage in the fourth round sends Ye Joon Kim to the canvas as the Japanese fighter retains his belts.

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,