Golden Boy has signed Mexico City’s Gustavo “Dorado” Rivera Rio (16-1, 11 KOs) to a promotional contract. A junior middleweight, Rivera Rio is ready to take his career to the next level under the Golden Boy Promotions banner. He enters this new chapter with a 16-1 record, including 11 victories by knockout. His lone professional defeat came in May 2024 against Alexander Espinoza. A fighter with 17 years of experience in the sport, Rivera Rio turned professional in March 2023 and in April 2025 registered a unanimous decision victory over Mexico’s Leonardo Sanchez. 

 

Nicknamed “El Dorado” by one of his professors, Rivera Rio was introduced to boxing by his father, a die-hard fan of the sport. He went on to build an impressive amateur résumé, competing in more than 150 bouts and representing the Mexican national team. Outside the ring, Rivera Rio has earned a reputation for being well-spoken and carrying himself with confidence and professionalism. Now backed by Golden Boy Promotions, “El Dorado” has his sights set on making an impact on boxing’s biggest stages.

 

“Gustavo brings that relentless Mexican fighting spirit,” said Golden Boy CEO Oscar De La Hoya.