Dhameystir weedha soo socota: 1991, Gratton waxaa loo doortay seddexaad 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 tartanka.
Waxaa loo doortay kooxda Tampa Bay Lightning.