Jan Maciej Błachowicz[1] (Polish: [ˈjan bwaˈxɔvitʂ]; born February 24, 1983) is a Polish professional mixed martial artist. He currently competes in the Light Heavyweight division for the Ultimate Fighting Championship (UFC), where he is the current UFC Light Heavyweight Champion. A professional since 2007, he also competed for KSW and is the former KSW Light Heavyweight Champion.