Combattants MMA — Performance Fitness MMA

Australian mixed martial artist (born 1996)

Giacomo "Jack" Della Maddalena, also known by his initials JDM, is an Australian professional mixed martial artist. He currently competes in the Welterweight division of the Ultimate Fighting Championship (UFC), where he is the former UFC Welterweight Champion. As of 5 May 2026, he is #4 in the UFC welterweight rankings.