at FMovies. UFC 203: Miocic vs Overeem is a mixed martial arts event produced by the Ultimate Fighting Championship (UFC) held on September 10, 2016 at the Quicken Loans Arena in Cleveland, Ohio. The event was headlined by a UFC Heavyweight Championship bout between current champion (and Cleveland area native) Stipe Miocic against 2010 K-1 World Grand Prix winner and former Strikeforce Heavyweight Champion Alistair Overeem.