Whakaotihia te rerenga e whai ake nei: I whanau a Fernández i Santa Clara, Cuba. E toru ngā whakamātau kore i taea e ia ki te rere ki Te Hononga o Amerika i mua i tana angitu i te tau 2008. I uru ia ki te Kura Tuarua o Braulio Alonso i Tampa, Florida, a i tohua e nga Marlins i te rauna tuatahi o te 2011 MLB draft. I hanga e Fernández tana MLB tuatahi me nga Marlins i te Paenga-whāwhā 7, 2013. I whakaingoatia ia ki te
2013 National League All-Star Team, a riro i te National League (NL) Rookie o te marama Tohu i roto i Hōngongoi me Akuhata. I muri i te wa, i riro i a ia te NL Rookie o te Tau Tohu me te tuatoru i te pooti mo te Tohu Cy Young. I whakahaeretia ia e Tommy John i te wa o te tau 2014 a i whakaingoatia ia ki tana takaro All-Star tuarua i te tau 2016.