Elkin Vows To Hurt Shields, Spoil MMA Debut At PFL 4 By Joseph Patrick Claressa Shields The 2021 season of the Professional Fighters League (PFL) has already provided quite a number of massive upsets, with big names such as Anthony Pettis, Lance Palmer, and Fabricio Werdum getting unfavorable results. When the second half of the season begins on Thursday, June 10th, the mixed martial arts (MMA) world could once again bear witness to a gigantic upset when three-division world champion and top pound-for-pound women’s boxer makes her debut in the sport against dangerous grappler Brittney Elkin. Without a doubt, Shields is one of the biggest names in combat sports today. That’s why her signing with PFL in December 2020 became a massive story.