Kammala jumla mai zuwa: A lokacin da yake matashi, Nagy ya taka leda a gasar 1993 na Quebec International Pee-Wee Hockey Tournament tare da tawagar daga Poprad. Ya fara aikinsa a 1995 a matsayin matashi na HC Košice a cikin Slovak Extraliga. An zaba shi a matsayin na 177 a cikin
1997 NHL Entry Draft ta St. Louis Blues. Bayan an tsara Nagy ya zo Arewacin Amurka kuma ya buga wasa tare da Halifax Mooseheads a QMJHL don kakar 1998 <unk> 99 kuma an kira shi mai kunnawa na 7 mafi mashahuri a lokacin bikin shekaru 15.