Kammala jumla mai zuwa: Wisniewski ya fara aikinsa na hockey na kankara tare da Plymouth Whalers na Ontario Hockey League (OHL) a shekara ta 2000. Ya inganta kowace shekara sosai, kuma an rubuta shi a zagaye na biyar, na 156th gaba ɗaya, ta Chicago Blackhawks a
A shekara ta 2002. A farkon kakar wasa ta 2003-04, an nada shi kyaftin din Whalers. A wannan shekarar, ya zura kwallaye 17, 11 a wasan da ya yi. Ya gama 24th a cikin duka ci da maki 70, na uku a tsakanin masu karewa kuma maki shida ne kawai daga jagorancin OHL, wanda mai kare Kingston Frontenacs Bryan Rodney ya kafa. Don kokarinsa, an ba Wisniewski kyautar OHL ta 2004 Max Kaminsky Trophy a matsayin mafi kyawun mai karewa. Ya kuma dauki gida na OHL ta mahaifiyar league, da Canadian Hockey League (CHL), Defenseman na shekara lambar yabo. Wannan girmamawa ya sami Wisniewski kwangila tare da Chicago, kuma ya tsallake zuwa Norfolk Admirals na American Hockey League (AHL), ƙungiyar Blackhawks'mafi ƙarancin haɗin gwiwa.