Watch: Kickboxer Sends Opponent Tumbling With Crunching Headkick

A brain-rattling headkick from kickboxer Krzysztof Mariańczyk left his opponent out for the count at The War 4. The sensational KO took place on the main card of the event on Saturday in Poland. Mariańczyk, who fights as a lightweight, was looking to keep his six-fight undefeated combat sports record in tact. The crushing headkick…

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