He failed to improve his personal best in 2013, but took a silver medal behind Leandro de Oliveira at the South American Road Mile Championships and was runner-up at the inaugural Chilean National Sports Games. Díaz returned to the track for Chile in 2014. First, he came close to a personal best at the South American Games in the Chilean capital but narrowly missed a medal behind Colombia's Rafith Rodríguez. After a personal best of 3:40.24 minutes in July, he scored two international bronze medals: first repeating his finish at the Ibero-American Championships, then coming third at the Pan American Sports Festival (Venezuela's Marvin Blanco won both times). In his last outing of the year he topped the podium at the South American Under-23 Championships with a championship record time of 3:44.52 minutes.