Bookmakers around Australia are refusing to pay out on last night's farcical IBO cruiserweight world title boxing bout which Danny Green won in under thirty seconds.

Green's opponent, Paul Briggs, came out of retirement for the fight but hit the canvas shortly after the opening bell and was counted out following a glancing blow.

The fight had been moved from Sydney to Perth after the New South Wales Combat Sports Authority raised concerns about Briggs' health.

After the fight a "pissed off" Green said Briggs was "not even a canine" and told a furious crowd that he "wouldn't be paid a cent".

Payouts on a first-round knockout have been suspended pending an investigation.

Neil Evans, from online bookmakers Centrebet, says there was a massive betting plunge on a round-one knockout win to Green which brought the price in from around $8 to $1.50.

"It officially started with us at $1.50, which is a price we've never seen before," he said.

"Round two was also backed as well, and to say it was a dubious fight would again be a massive understatement.

"It puts the credibility of boxing in this country back in the gutter."

Ryan Kay from Betezy says he also became suspicious pre-fight.

"It wasn't just one bet of $20,000, they kept coming. People ringing up all day wanting more and more, and it smelt quite bad," he said.

"People ringing up wanting $20,000, $10,000 at a time on the first round [knockout]. To be honest it's pretty unheard of for any boxing event.

"I made a few calls to a few people yesterday to say is this fight fair dinkum and I was told it was. It smelt anyway."

The chairman of the Professional Combat Sports Commission, Simon Watters, has defended his decision to sanction the fight.

"If someone turns up at a boxing event and they might be in pristine, perfect health, and they decide themselves they are going to take a dive there's very little that anyone can do regulate or stop that," he said.

"From what I saw and from where I was sitting the blow didn't seem to connect," Mr Watters added.

Police in Perth say they were forced to escort both Green and Briggs out of the stadium.

Inspector Jeff Ellis says a big police contingent managed to control the crowd.

"I think the short-lived bout was the reason why the crowd became so agitated," he said.

"It's clear that people paid a lot of money to go and see this fight and certainly were disappointed that the fight didn't go on longer."