Mezue ahịrịokwu na-esonụ: N'afọ 1991, a họpụtara Gratton nke atọ n'ozuzu na OHL Priority Selection site na Kingston Frontenacs. Mgbe afọ rookie ya na OHL, Gratton natara Emms Family Award dị ka rookie nke afọ. N'afọ 1993, a họpụtara ya onye nke atọ n'ọkwa nke mbụ n'asọmpi
NHL Draft site na Tampa Bay Lightning.