WBA interim flyweight champion Luis ‘El Nica’ Concepcion (19-1, 14 KOs) scored a brutal fourth round KO over former world champion Roberto ‘Mako’ Leyva (26-10-1, 21 KOs) on Friday night at the Arena Roberto Duran in Panama City, Panama. It was a vicious one-two combination from Concepcion that put Leyva down for the count. Time was 2:11. Leyva was game but never in the fight as Concepcion simply outgunned him and beat him down in impressive fashion.