Luka Doncic Dallas Mavericks Signed Autographed ROY Basketball Ball w Panini COA. Limited to only 177. This is number 8. Small smudge on the’roy’, but overall a great and bold signature. The item “Luka Doncic Rookie of the Year Signed ROY Basketball Ball w Panini COA Limited” is in sale since Friday, June 11, 2021….