Rubuta ci gaba don wannan sakin layi - Ya fito ne daga yanayin wasanni, kamar yadda mahaifiyarsa Julia del Río ta yi gasa a duniya don Chile a gasar zakarun duniya ta IAAF. Ya fara horo a cikin nesa mai nisa tare da mahaifiyarsa a matsayin mai horar da shi tun yana ƙarami. Díaz ya fara halartar gasar kasa da kasa a gasar zakarun matasa ta Kudancin Amurka ta 2008, inda ya kasance na tara. Ya wakilci kasarsa a matakin duniya shekara guda bayan haka, yana gudana a cikin zafin jiki a gasar zakarun duniya ta matasa ta 2009 a wasannin motsa jiki. Ya koma matakin nahiyar a gasar zakarun Turai ta matasa ta Kudancin Amurka ta 2010 a Wasannin motsa jiki kuma ya sami nasararsa ta farko, inda ya dauki zinare na mita 1500 a kan gida a Santiago de Chile. Wani lambar yabo ta matasa ta zo ne a gasar zakarun Turai ta 2010 ta Kudancin Amurka, inda ya kammala na huɗu ya jagoranci Chile zuwa lambobin tagulla na tawagar. Ya fara samun ci gaba a cikin rukunin 'yan kasa da shekaru 20 a gasar zakarun Turai na matasa na Kudancin Amurka a shekarar 2011
, ya dauki tagulla a matsayin ƙaramin ɗan wasan tseren mita 1500 da na huɗu a tseren mita 800.