There are few guarantees in life, but watching Justin Gaethje in a fist fight is guaranteed to be be exciting.

And such was the case in Philadelphia tonight, where the American took on Edson Barboza in the main event of UFC on ESPN 2. At first, the pair went back and forth just as fans suspected, exchanging kicks with each other early on.

Then, the duo swapped kicks for punches, getting into swinging encounters which, eventually, saw Barboza collapse to the ground unconscious.

Check out the brilliant fight ending in the video below:

WE TOLD YOU THIS FIGHT WOULDN'T DISAPPOINT!@Justin_Gaethje puts Barboza away in round 1! #UFCPhiladelphia pic.twitter.com/WD40HcctN9

— UFC (@ufc) March 31, 2019

–