Rubuta ci gaba ga wannan sakin layi - A 1991, an zabi Gratton a matsayin na uku a cikin OHL Priority Selection ta Kingston Frontenacs. Bayan shekara ta farko a cikin OHL, Gratton ya sami lambar yabo ta Emms Family a matsayin rookie na shekara. A 1993, an zaba shi na uku a cikin NHL Draft
ta hanyar Tampa Bay Walƙiya.