BOX champion Julio Cesar Martinez was retroactively knocked out after a rare use of VAR.
The WBC has been known to use instant replays in the past, including a fight with Martinez in 2019.
This time, the Mexican received a 10-8 draw against Ronal Batista after the referee initially failed to score a knockdown.
But on replays, the decision was overturned and the knockdown scored.
It left some fans confused and accused the WBC of making up their own rules.
One said: “VAR in boxing now?”
Another added: “Mauricio Sulaiman, the belt specialist who makes rules for Eddy Reynoso camp.”
One commented: “Since when does this come into play???”
Another wrote: “Nah VAR already ruined football now boxing is next.”
Martinez in 2019 saw a knockout on Charlie Edwards become a no-contest due to low hits.
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The result was initially heralded as a Martinez win until WBC President Mauricio Sulaiman stepped into the ring to change the decision.
28-year-old Martinez defeated 26-year-old Batista by majority decision to retain his flyweight title.
And it could bring about a union with British IBF champion Sunny Edwards, 27.