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Román González was the WBA junior flyweight champion from 2020 to 2021. He won the title by defeating Khalid Yafai by unanimous decision on January 18, 2020. He defended the title twice, defeating McWilliams Arroyo by unanimous decision on July 26, 2020 and Julio César Martínez by split decision on February 27, 2021. He lost the title to Juan Francisco Estrada on March 13, 2021.