Claressa Shields had to work for her first professional win in MMA. The decorated boxer made a successful MMA debut on Thursday night , stopping Brittney Elkin (3-7) via TKO in the third round of their lightweight contest. The bout served as the main event of the 2021 PFL 4 card in Atlantic City, N.J. Shields (1-0) struggled early with Elkin’s ground game, but managed to mount a comeback and stop Elkin with ground-and-pound
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