Waxad ku qortaa sii wadida faqradan - 1991-kii, Gratton waxaa loo doortay kaalinta saddexaad ee guud ahaan OHL Xulashada mudnaanta leh ee Kingston Frontenacs. Kadib sanadkiisii rookie ee OHL, Gratton wuxuu helay Emms Family Award oo ah rookie-ka sanadka. Sanadkii 1993, waxaa loo doortay kaalinta saddexaad ee guud ee NHL Draft
waxaa ciyaaray Tampa Bay Lightning.