A 25-year-old American fighter swung his shin bone like a baseball bat, flattening his opponent in an instant

• Clayton Carpenter swung his shinbone like it was a baseball bat at a recent MMA fight.
• The strike landed so well it resulted in a home run of a knockout, sealing a 13-second win.

American combat sports prospect Clayton Carpenter extended his unbeaten start to his pro MMA career with a knockout win that sent ripples through the industry.

The 25-year-old had returned wins achieved in a variety of ways — rear-naked choke, head kick, and kneebar — even before his flyweight fight against Rodney Kealohi at the LFA 119 event December 3 in Arizona.

But after hardly any time in the cage with Kealohi, Carpenter was able to add another win to his ledger.

In the tenth second of the bout, Carpenter swung his shinbone like it was a baseball bat and landed a home run knockout strike on Kealohi's face.

The momentum of Carpenter's attack saw him swing another two strikes at Kealohi, who was unconscious on his feet from the head kick alone, before falling back to the canvas, defeated.

Carpenter jumped on Kealohi to make sure of the win, but a quick-thinking referee intervened quickly to wrestle the fighter off of him and declare him the winner.

It was all over.

Watch it right here:

With the victory, Carpenter advanced his unbeaten pro MMA record to five wins (two knockouts, two submissions, and one decision) against zero losses.