Naoya Inoue remained undefeated after retaining the undisputed junior featherweight title with an eighth-round technical knockout of Ramon Cardenas in front of a packed house inside T-Mobile Arena and a nationally televised audience on ESPN.

Japan's Naoya Inoue climbs off the canvas to retain his status as undisputed super bantamweight world champion with stoppage of American Ramon Cardenas in Las Vegas.

Unbeaten Naoya Inoue of Japan retained his undisputed super bantamweight world crown on Sunday, climbing off the canvas to stop American Ramon Cardenas in the eighth round in Las Vegas. Inoue improved to 30-0 with his 27th victory inside the distance when referee Thomas Taylor halted the fight 45 seconds into the eighth round after a flurry of powerhouse punches by the champion with Cardenas only able to cover up.