Claudio Ezequiel Marrero Guzmán was born on March 6, 1989, in Santo Domingo, Dominican Republic. He represented the Dominican Republic in international amateur boxing, competing primarily in the bantamweight division before moving to featherweight.
Marrero established himself in international amateur boxing during the 2000s. He won gold at the 2006 Pan American Junior Championships and reached the quarterfinals of the 2006 World Junior Championships. At the 2007 Pan American Games in Rio de Janeiro, Brazil, he won the silver medal in the bantamweight division. He also competed at the 2007 AIBA World Boxing Championships in Chicago and the 2009 championships in Milan.
In 2008, Marrero won a bronze medal at the American Olympic Qualifier in Port of Spain, Trinidad and Tobago. He defeated José Pantaleón of Guatemala before losing 12–1 to Cuba's Yankiel León in the semifinal; the result left him short of qualification for the Beijing Olympic Games. He later won a bronze medal at the 2009 Pan American Championships in Mexico City while competing as a featherweight.
Marrero began his professional career in 2010 and developed a reputation as a southpaw boxer-puncher. He won the WBA Fedelatin and WBA-NABA featherweight titles in 2012. On August 23, 2013, he challenged Jesús Cuellar for the interim WBA featherweight championship and lost a twelve-round unanimous decision, the first defeat of his professional career.
Marrero returned to the world-title picture on April 29, 2017, when he stopped Carlos Zambrano in the first round in Las Vegas to win the interim WBA and IBO featherweight titles. He lost the interim WBA title to Jesús Rojas by seventh-round knockout on September 15, 2017. After subsequent bouts against Tugstsogt Nyambayar, Eduardo Ramírez, Kid Galahad, Xavier Martínez, Luis Castillo Leal, Viktor Slavinskyi, and Gonzalo Fuenzalida, his documented professional record stood at 27 wins and 5 losses, including 19 victories by knockout, following his February 11, 2023 victory over Fuenzalida.
Marrero won the silver medal in the bantamweight division at the 2007 Pan American Games in Rio de Janeiro, Brazil, establishing him as one of the Dominican Republic's leading amateur boxers of his generation.
He won a bronze medal at the 2008 American Olympic Qualifier in Port of Spain, Trinidad and Tobago, coming within one victory of qualifying for the Beijing Olympic Games.
He won a gold medal at the 2006 Pan American Junior Championships and later earned a bronze medal at the 2009 Pan American Championships in the featherweight division.
Marrero won the interim WBA and IBO featherweight titles by stopping Carlos Zambrano in the first round on April 29, 2017.
Physical Characteristics: Marrero is a southpaw boxer. He is listed at approximately 173 centimeters in height with a similar reach.
Quotes from others about the person
Marrero has been described by trainer and manager Herman Caicedo as an elusive, aggressive southpaw with an effective jab, counterpunching ability, and strong ring movement.
