Dee ihe ga-aga n'ihu na paragraf a - N'afọ 1991, ndị Kingston Frontenacs họpụtara Gratton onye nke atọ n'ozuzu na OHL Priority Selection. 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'usoro NHL Draft
site na Tampa Bay Lightning.