Naoya Inoue, arguably the top pound-for-pound boxer on the planet and undisputed junior featherweight champion, returns to the ring on Friday. Inoue will defend his four world championships against Ye Joon Kim in a main event from Tokyo's Ariake Arena.

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.

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,