Pedzisa mutsara unotevera: Fernández akaberekerwa muSanta Clara, Cuba. Akaedza katatu kuti apinde muUnited States asi haana kubudirira, akazobudirira muna 2008. Akanyoresa paBraulio Alonso High School muTampa, Florida, uye akasarudzwa neMarlins munharaunda yekutanga ye2011 MLB draft. Fernández akaita MLB yake kutanga neMarlins musi waApril 7, 2013. Akapiwa zita rokuti
2013 National League All-Star Team, uye akahwina National League (NL) Rookie yeMwedzi Mubairo muna Chikunguru naNyamavhuvhu. Mushure memwaka, akahwina mubairo weNL Rookie wegore uye akapedza wechitatu muCy Young Award kuvhota. Akaitwa Tommy John kuvhiyiwa munguva yegore ra2014 uye akatumidzwa zita rake rechipiri All-Star Game muna 2016.