Berchelt (34-1-0, 30 knockouts) imposed his will and landed bis punches mostly at will from the outset, against a brave but outclassed Barros (42-6-1, 22 knockouts).
At the end of the second round, the world champion sent Barros to the canvas with a dizzying left hook to the head. He only just survived to hear the bell.
In the third round plenty more punishment dished up and dished out, and following a heavy left-right combination to the head, Jonathan was again canvassed.
He got up and continued, but his Corner had seen more than enough.
They got into the ring, to stop the one-sided drubbing.
Delighted at such a powerfully convincing home win, Alacran said: “I felt strong, there was no way that the Argentine fighter could beat me in front of my Yucatecan people. Thank God I gave them such a triumph.”