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Martinez was scheduled to make his second title defense against Maximino Flores on October 23, 2020. Four days before the fight, Flores announced his withdrawal from the bout due to a positive COVID-19 test. Accordingly, Martinez was rescheduled to defend his title against Moisés Calleros. Calleros accepted the fight on less than one week’s notice. Due to the short notice, he was unable to cut weight properly, and weighed in at 117.4 pounds, 5.4 pounds over the title limit. Martinez won the fight by a second-round technical knockdown. He staggered Calleros with a left hook-right straight combination, before unloading with numerous power punches, which forced the referee Cesar Castanon to stop the fight at the 2:42 minute mark. During the post fight interview, Martinez stated his desire to fight fellow titleholder Artem Dalakian and Moruti Mthalane in a title unification bouts, before moving up to super flyweight
