The 31-year-old Russian knocked out the opponent at 38 seconds of the first round, breaking through with a roundhouse kick to the body.
For Koreshkov, this is 25 career wins with four defeats.
The 34-year-old American lost his fifth fight in MMA with 16 fights won.
Earlier, the UFC confirmed that Bobby Green will fight against Islam Makhachev.
🌪 Vintage Koreshkov!🦵💥
The spinning back kick once again gets the job done for The Spartan!
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Watch #Bellator274 LIVE on @SHOSports.
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— BellatorMMA (@BellatorMMA) February 20, 2022