The PFL 4 mixed martial arts event for the 2021 season of the Professional Fighters League was held on June 10, 2021. This was the fourth regular season event of the tournament and included fights in the Featherweight and Lightweight divisions. Boxing champion and Olympic gold medalist Claressa Shields made her MMA debut in the main event against Brittney Elkin.
Claressa Shields is looking to add another belt to her already impressive collection. Shields will put her WBO and WBC super welterweight titles on the line when she steps into the ring against IBF champion Marie-Eve Dicaire.