The former WWE star, 43, dominated Harley Morenstein in their bout in Tampa, Florida on Saturday night.
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Hennigan put his opponent on the canvas three times in the opening three rounds before the fight was called off.
And wrestler Hennigan called out KSI for a fight after his dominant win on the pay-per-view event.
He said: “Boxing is different from wrestling and stunt choreo. I know how hard I worked, I know how hard Harley worked.
“I have all the respect in the world for that man.
“But there are some influencer boxers I have zero respect for.
“Jake Paul, Logan Paul. They make me sick. Overnight tough guys. The entire Misfits boxings.
“Jake Paul got beat. Logan got beat by KSI, which is why I’m going to put KSI on blast right now. You hear me? Come on.”
KSI will take on Joe Fournier in London on May 13 in his next fight.
Hennigan’s clash with Morenstein was the co-main event on Creator Clash 2 in Tampa.
In the main event bout, Alex Wassabi beat iDubbbz by majority decision.
Wassabi won the four-round contest 39-37 on two cards while the other was a 38-38 draw.
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