Rubuta ci gaba don wannan sakin layi - MacKenzie ya fara aikinsa na matasa yana wasa da garin Sudbury Wolves na Ontario Hockey League (OHL). Bayan kakar wasa ta biyu, wanda ya kara yawan maki daga 20 zuwa 87, Atlanta Thrashers ta zaba shi a zagaye na biyar, 128 gaba daya, a cikin 1999 National Hockey League (NHL) shigarwa.
Ka yi haƙuri. A lokacinsa na ƙarshe, ya yi rajistar kwallaye 40 da maki 89 wanda ya jagoranci Wolves a maki kuma ya gama na shida a OHL. Ya kuma gama da kashi 67 cikin dari na cin nasara, ya lashe duka OHL da Canadian Hockey League (CHL) Face-off Awards.