Erazo began his professional playing career at El Nacional, where he spent six seasons. He then joined Barcelona SC in January 2012.
He made his Barcelona SC debut on 2 February 2012 against Deportivo Cuenca and won 3-1. He scored his first goal for the club against LDU Quito on 29 April 2012 in a 2-2 draw. He helped Barcelona SC become Ecuadorian Serie A champions that season, the club's first league title since 1997. This league title was also the first honour in Erazo’s career.
In January 2014, Erazo moved to Brazilian side Flamengo. He made his debut on 2 February 2014 in a 5-2 Campeonato Carioca win over Macaé, but was sent off during the match. Erazo played a further five Campeonato Carioca matches (the annual football championship of Rio de Janeiro) matches for Flamengo, helping them to the state title.