Claressa Shields climbs the cage after a Professional Fighters League mixed martial arts bout against Brittney Elkin in Atlantic City, N.J., Friday, June 11, 2021. (AP Photo/Matt Rourke)

Claressa Shields, right, reacts after winning a Professional Fighters League mixed martial arts bout against Brittney Elkin in Atlantic City, N.J., Friday, June 11, 2021. (AP Photo/Matt Rourke)

Brendan Loughnane, right, doges a kick by Tyler Diamond during a Professional Fighters League mixed martial arts bout in Atlantic City, N.J., Thursday, June 10, 2021. (AP Photo/Matt Rourke)

Claressa Shields, top, punches Brittney Elkin during a Professional Fighters League mixed martial arts bout in Atlantic City, N.J., early Friday, June 11, 2021. (AP Photo/Matt Rourke)

FILE - In this March 3 2021, file photo, boxers Claressa Shields speaks during a news conference in Flint, Mich. Shields did it all in boxing. Two-time Olympic gold medalist. Professional titles in three weight classes. Now she'll try to conquer MMA, starting with her pro debut for Professional Fighters League on Thursday night, June 10, 2021, in Atlantic City, N.J. (Jake May/The Flint Journal via AP, File)

Bubba Jenkins gestures during a Professional Fighters League mixed martial arts bout against Bobby Moffett in Atlantic City, N.J., Thursday, June 10, 2021. (AP Photo/Matt Rourke)

Brendan Loughnane, right, and Tyler Diamond trade punches during a Professional Fighters League mixed martial arts bout in Atlantic City, N.J., Thursday, June 10, 2021. (AP Photo/Matt Rourke)

Bubba Jenkins blocks a kick from Bobby Moffett during a Professional Fighters League mixed martial arts bout in Atlantic City, N.J., Thursday, June 10, 2021. (AP Photo/Matt Rourke)

Brendan Loughnane, right, follows through on a right to Tyler Diamond during a Professional Fighters League mixed martial arts bout in Atlantic City, N.J., Thursday, June 10, 2021. (AP Photo/Matt Rourke)