Name: Ivan Calderon
Alias: Iron Boy / El Nino De Hierro
Birth Name: Iván Calderón Marrero
Hometown: Guaynabo, Puerto Rico
Birthplace: Guaynabo, Puerto Rico
Pro Boxer: Record
Manager: Peter Rivera
Trainer: Jose Sanchez
Ivan Calderon was known as a great pure boxer.
Calderon also defeated Miguel Angel Cotto during his amateur career.
- 1999 Light Flyweight Bronze Medalist at the Pan-American Games in Winnipeg, Canada. Results were:
- 2000 Puerto Rican light flyweight representative at the 2000 Sydney Olympic Games. His result was:
- Lost to Masara La Paene (Indonesia) on points 5-10
- Held the WBO Minimumweight Championship from 2003 to 2007 and successfully defended it eleven times.
- Held the WBO and Ring Light Flyweight Championship from 2007 to 2010 and successfully defended it six times.
- The Ring rated Calderon as the ninth best pound-for-pound boxer in the world in 2008.
- Lost three of his last four fights by knockout and retired in October 2012 with a record of 35-3-1 (6 KOs).
- Upon Calderon's retirement, Dan Rafael of ESPN wrote that he "is widely considered the best fighter in the history of the strawweight [minimumweight] division other than Hall of Famer Ricardo Lopez of Mexico."
- Retired with a record of 18-3-1 (2 KOs) in world title fights.
- Retired with a record of 9-3-1 (0 KOs) against former and current world titlists.
Eduardo Ray Marquez
| WBO Minimumweight Champion
2003 May 3 – 2007 Sep
Hugo Fidel Cazares
| WBO Light Flyweight Champion
2007 Aug 25 – 2010 Aug 28