The PFL 2 mixed martial arts event for the 2018 season of the Professional Fighters League was held on June 21, 2018, at the Chicago Theatre in Chicago, Illinois. It was the second regular season event of 2018 and included only fights in the lightweight and light heavyweight divisions.

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.

Bellator 181: Girtz vs. Campos 3 took place on July 14, 2017, at the WinStar World Casino in Thackerville, Oklahoma. The main event featured Brandon Girtz against Derek Campos in a rubber match. Campos won the pair's initial meeting in June 2013 at Bellator 96 by unanimous decision. Girtz avenged the loss in November 2015 at Bellator 146, where he won by knockout in the first round.