Amorín arrived in 1952 in Guatemala to play for Guatemala FC.
He has spent the majority of his coaching career in Guatemala, where he won a record eight national titles with three clubs from 1964 to 1992, He took Municipal and Comunicaciones to win the CONCACAF Champions Cup in 1974 and 1978.
He also had five tenures as coach of the Guatemala national team, winning the 1967 NORCECA Championship (now the CONCACAF Gold Cup) which is the highest international honor for that national team to date. He retired in 1994.
Due to his success at both the club and international level, Amorín has been catalogued as the greatest coach in the history of Guatemalan football by the local press and by many observers. On 24 December 2014, he died of Alzheimer's disease at the age of 87.
- Also sp. Matos in some sources.
- Fallece Rubén Amorín, el técnico más ganador del fútbol de Guatemala - Mundo Deportivo (in Spanish)
- Se despide una leyenda del futbol nacional: Don Rubén Amorín - Prensa Libre (in Spanish)
- Pocón, David. "El viejo zorro de la táctica y la estrategia". Diario de Centro América. Archived from the original on 2011-07-21. Retrieved 2010-02-05.
- Ruben Amorin Tecnico fallece mas grande Uruguay-Guatemala - Prensa Libre (in Spanish)
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