Marlon took up riding at age four in Fortaleza, Brazil. He was influenced by his grandfather Darcy and his father Mario, who built a riding school from scratch. His parents Mario and Maristela developed a project called Equitakids in Maceio, Brazil, to get children started in sport at an early age.
After riding for Helio Pessoa in Guatemala and Yuri Mansur in Sao Paulo, Brazil, he went to Europe to ride under Belgian jumper Ludo Philippaerts in April 2008. "I thought I would get there and just immediately participate in contests and ride good horses but I had to earn my space, which was a very good experience.