Arena CDMX in Mexico City hosts Saturday’s UFC on ESPN: Moreno vs. Erceg event. On Friday, the athlete competing on the fight card will officially weighed in.  The event is headlined bye a a flyweight bout between former two-time champion  Brandon Moreno and No. 8 ranked  Steve Erceg . Moreno (22-8-2) will enter the fight coming off a win over No.