The sound Naoya Inoue's knockout shot made when it cracked his opponent's body shows how brutal boxing can be

• Naoya Inoue extended his unbeaten pro boxing record to 21 wins with 18 KOs Saturday.
• The Japanese fighter is one of the best boxers in his sport.
• Watch him mercilessly punish his most recent opponent's body in the clip below.
• Visit Insider's homepage for more stories.

The sound Naoya Inoue's knockout shot made when it cracked his opponent's body shows how brutal elite boxing can be.

The Japanese fighter is regarded as one of the sport's best combatants, and showed his devastating ability to ferociously finish an opponent at will Saturday, during a Top Rank event at the Virgin Hotels in Las Vegas.

The three-weight champion needed only three rounds to beat the fight out of his opponent Michael Dasmariñas, who crumbled with an excruciating power punch to the midsection.

Inoue scored three knockdowns in the first three rounds alone, landed 38 of his 112 total punches (17 of which hit the body), and extended his flawless pro boxing record to 21 wins (18 knockouts and three decisions).

Watch highlights of the win right here:

Inoue said after the result was confirmed that it was a "great win" for him.

"I prepare myself to knock them out, whether with a head shot or a body shot," the 28-year-old said. "I came prepared and to get a win by knockout is good for me.

"The first round, I just wanted to see what he had. It depended on how he came out, and after a little while, yeah, I thought I could get him out."

Inoue is the WBA, IBF, and The Ring champion at bantamweight, and is ready to challenge the winner of August's showdown between Johnriel Casimero and Nonito Donaire, he said.

"Getting the win makes me smile, but to be able to fight the winner of Casimero and Donaire, that brings me another smile."

Inoue's promoter, Top Rank founder and CEO Bob Arum, called his fighter "a unique force of nature inside that ring."

Arum said: "Another incredible performance from 'The Monster.' We are seeing a great fighter at work here, and he is only going to get better."