LOS ANGELES (AP) — Two-time Olympic boxing gold medalist Claressa Shields has a date and an opponent for her mixed martial arts debut with the Professional Fighters League. The promotion tells The Associated Press that Shields will fight Brittney Elkin on June 10. The bout in Atlantic City, New Jersey, will be the beginning of Shields’ daunting quest to add MMA success to her boxing championships, which include professional world titles in three weight classes. Shields announced her decision to take up MMA late last year, telling the AP she was determined to claim championship belts in both of the major combat sports.