[1] Melián reached the final of the 2010 South American Games at light flyweight, but lost to Oscar Negrete.

At the 2012 Summer Olympics he was defeated in the preliminary round of the men's bantamweight tournament by Sergey Vodopyanov, 5-12.

[2] At the 2016 Summer Olympics he again participated in the men's bantamweight tournament, winning his first two bouts but losing to Murodjon Akhmadaliev by technical knockout in the quarter-finals.

In 2014, Melián was awarded the "Firpo de Oro" as the best boxer in the country, amateur or professional, by the Boxing´s Journalist Union of Argentina (UPERBOX).

After knocking out the former world title contender Diego Ricardo Santillan in the fifth round in his debut (who entered the ring at 23-2), Melian received the challenge of Aristule, who was present at ringside.