Dave Allen’s win against Dorian Darch on Saturday is being investigated by the British Boxing Board of Control and the Gambling Commission, according to The Sun.
Allen beat Darch in a third-round knockout at the Sheffield Arena at the weekend in a heavyweight clash.
Heavy favourite Allen cruised through the opening two rounds before destroying Darch as soon as the third round started.
Allen knocked his opponent to the canvas before finishing the fight.
Initially, a third-round win for Allen was around 9/2 with bookmakers but was so heavily backed that it reached evens before the fight.
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SkyBet first noticed a “concerning” spike in bets on the six-round Sky Sports fight and they alerted their competitors.
A couple of hours before the fight, the betting industry spotted an “extraordinary” surge of bets on a third-round win.
BBBofC secretary Robert Smith told The Sun on that the commission had contacted him with their concerns and an investigation is now underway.
Sky Sports tweeted out a video of the knockout and it left boxing fans calling ‘FIX!’
However, it must be noted that Darch, who lost the fight, denies any wrongdoing.
“Should have chucked a couple of quid on myself if I knew lol," he tweeted.
“People are nuts get hit down once get back up, get wobbled to my boots with a left hook but still dull enough to try and act hard and pretend not to be hurt and call him on and I've taken a dive brilliant x.
“Just hard to get your head around butt i know being a journeyman is a job I got f**k all to gain be losing in a certain round I cant bet myself.
“I'm a trying journeymen who got beat in round 3. If I would av covered up like a koala and lost on points would that have been a fix?x”
Meanwhile, Allen also defended himself by tweeting: “People were saying it was a fix because I was planning on it being a six-round move around.
“A few of my mates had a lot of money on the points win and it didn’t come in but I am not the sort of guy who picks a round to win, I am not really good enough to do that.
“I am a heavy-handed hard b****** and I caught him with a left hook, I stepped off and he said ‘come on’ so I attacked him to the body and put him over. I haven’t lost or made any money on it.”
The Gambling Commission said: "We don't comment on ongoing investigations or confirm they exist because doing so could harm any investigation or could unjustifiably damage reputations.
"We may comment on a case after its conclusion but many cases are led by other bodies including sports governing bodies or law enforcement agencies."