Tuhia he tomokanga mo tenei whitianga - I whakatauhia e ia he rekoata whaiaro mo te decathlon o te 8057 i tona taone nui o Havana i te Poutu-te-rangi 2008, ka pakaru i te aukati 8000-tohu mo te wa tuatahi. Ko te putanga tuatahi o Díaz i runga i te atamira o te ao i muri tata mai i nga Orimipia Raumati 2008, engari kaore ia i whakataetae i tana kaupapa tohunga engari hei waahanga o te roopu relay 4 × 400 mita o Cuba me Yunier Pérez, William Collazo me Omar Cisneros. Kaore te kapa i eke ki tua atu o te waahanga wera o te whakataetae. I riro i a ia tana mētara matua tuatahi i te tau e whai ake nei i Havana i te 2009 Central American me Caribbean Championships i roto i te Athletics
, ka mutu hei kaihautū i muri i tana hoa whenua a Leonel Suárez engari i kaha ki te eke ki runga ake i te 8000 nga tohu mo te wa tuarua i roto i tana umanga me te katoa o te 8013.