Career
In 2009 he was capped two times for the Venezuelan national team Deportivo Táchira
Fernández began his career playing for Deportivo Táchira. In 2004, he was included in the Deportivo first-team squad.
During his six years at Estadio Polideportivo de Pueblo Nuevo, he scored 12 goals in 151 matches.
Deportivo Lara
In 2010 Fernández signed for Deportivo Lara. He made his debut on 8 August in a 1–0 home defeat against Zulia, coming on as a substitute for Pedro de Pablos.
On 24 September, Fernández scored his first goal for Deportivo Lara in a 2–2 draw against Zamora. Marlon netted Deportivo"s only goal in a 2–1 defeat at Deportivo Anzoátegui on 13 February 2011.
= Cherno More (loan) On 3 January 2012, Cherno More Varna confirmed Fernández has joined on loan until the end of the season.
He made his league debut on 4 March, in a 2–1 defeat to Levski Sofia. On 17 March, Marlon scored his first competitive goal for the club, scoring the match"s only goal against Minyor Pernik.