The PFL 1 mixed martial arts event for the 2021 season of the Professional Fighters League was held on April 23, 2021. This was the first regular season event of the tournament and included fights in the Featherweight and Lightweight divisions. The event was headlined by a lightweight clash between the former UFC and WEC Lightweight champion Anthony Pettis and the UFC veteran Clay Collard.

PFL 4: 2023 Regular Season was a mixed martial arts event that took place on Thursday, June 8, 2023 at the Overtime Elite Arena in Atlanta, Georgia.

PFL 4 was a mixed martial arts event produced by the Professional Fighters League that took place on June 8, 2023, at the Overtime Elite Arena in, Atlanta, Georgia, United States. In the main event, 2022 featherweight champion Brendan Loughnane faced Jesus Pinedo.

UFC Fight Night 153: Gustafsson vs. Smith was a mixed martial arts event produced by the Ultimate Fighting Championship that was held on June 1, 2019 at the Ericsson Globe in Stockholm, Sweden. A light heavyweight bout between former UFC Light Heavyweight Championship challengers Alexander Gustafsson and Anthony Smith was the event's headliner.