John Riel Reponte Casimero, born on February 13, 1989, is a Filipino professional boxer and also active on YouTube. His boxing career has seen him achieve world championships across three weight classes. These titles include the IBF junior-flyweight title held from 2012 to 2013, the IBF flyweight title secured in 2016, and the WBO bantamweight title held from 2019 to 2022. Known as “Quadro Alas” in Tagalog, which translates to “Four Aces,” he has built a remarkable reputation in the boxing world.
Casimero’s journey in professional boxing began in the flyweight and light-flyweight divisions. In a swift progression, he secured the vacant Philippines Boxing Federation (PBF) flyweight title by defeating Rodel Quilaton on August 23, 2008. His victory came through a unanimous decision (UD) over ten rounds. Following this, Casimero stepped down a weight class to light flyweight. There, he clinched the vacant WBO Asia Pacific Light Flyweight title by stopping Liempetch Sor Veerapol of Thailand with a technical knockout (TKO) in the fifth round. His successful defense of this title included a victory over Ardin Diale, which paved the way for a significant turning point in his career.
In a notable event at light-flyweight, Casimero faced off against César Canchila on December 19, 2009, in Managua, Nicaragua. The match was for the interim WBO light flyweight title. Canchila, a former interim WBA Light Flyweight champion from Colombia with a record of 28–2, entered the fight with a loss to the current WBA light flyweight world champion Giovanni Segura. Notably, Casimero’s victory against Canchila was his first bout outside his home country. Throughout the fight, Casimero displayed an impressive performance, scoring multiple knockdowns. The referee eventually halted the contest in the 11th round of the scheduled 12 rounds, securing Casimero’s victory and the interim title.
This victory positioned Casimero for a potential title shot against Iván Calderón of Puerto Rico. Calderón had previously defeated Filipino boxer Rodel Mayol, adding another layer of significance to the potential matchup.
Casimero’s journey in the boxing world continues to be marked by remarkable achievements and pivotal moments in the ring.