Career
Born in Guatemala City, Monzón started his career in the youth divisions of Aurora Football Club, who promoted him to the Liga Mayor (top division) in 1977. He spent almost his entire professional career at that club, being part of the league-winning squads of the 1978, 1984, 1986, and 1992-1993 seasons. He ended his club career with a stint at Circuit Switched Data Municipal.
Monzón was first called up to the Guatemalan national team in 1979, and represented it at the 1983 Pan American Games, where the team obtained the silver medal.
Later, he played during the World Cup qualification processes for the World Cups of 1986, 1990, and 1994. He was also part of the squad that participated at the 1988 Olympic Tournament.
His last cap was against Honduras in 1992. He was succeeded by Juan Manuel Funes as the national team captain.
After his retirement from playing in 1994, Monzón became a coach, being in charge of the Guatemala Under-17 team in his early coaching years.
After having been an assistant coach for club Municipal, he was appointed their manager in April 2007. He succeeded Enzo Trossero at this position, which Monzón held until November 2007 when he was substituted by Jorge Benítez.