Danny Green's IBO cruiserweight world title bout against Paul Briggs ended in farce after Briggs was knocked out just 29 seconds into the first round by a punch that hardly touched him.

Briggs stumbled a few steps, dropped to the canvas and was counted out after copping a mere graze to the head from a weak Green left jab that would have hardly fazed a commoner in the street.

Green was left fuming at Tuesday's weigh-in when Briggs tipped the scales at 87.2kg, more than three kilograms above the agreed 84kg limit.

But the West Australian was even angrier after the inept showing from Briggs, who was returning to the ring for the first time since 2007.

Briggs was booed as he left the arena as irate fans, who paid a minimum of $59 to attend the fight, showered the Queenslander with beer while chanting "bull-shit".

"Guys, just chill out, no one's as pissed off as me, believe me," an irate Green said.

"There's not one more person in this room is more jacked than me.

"I can't say sorry enough for that person. He ain't even a canine. Paul Briggs ain't getting paid a cent.

"I don't blame each and every one of you guys in here for being filthy.

"I want to go to the change room right now and give him the flogging he deserves.

"I'm ... spewing and I can't say sorry enough for you guys. I will make it up to you guys. Thank you very much for coming out and supporting me.

"He ain't getting paid guys, I'm very sorry. I can't do anything more.

"I just can't say sorry enough. I don't know, I'm just flipping out right here."

The fight was switched from Sydney to Perth at late notice after the NSW Sports Combat Authority refused to sanction the bout due to health concerns surrounding Briggs.

Since ending his retirement last year, Green has defeated Anthony van Niekerk, Julio Cesar Dominguez, Roy Jones Jr, Manny Siaca and now Briggs, although the latest fight could be hardly considered a bout.

The win improves Green's record to 30 wins (27 by knockout) and three losses.

Police say one man has been charged with assault after a police officer who was escorting Briggs back to his dressing room was struck by an object.

On the undercard, New Zealand heavyweight boxer Shane Cameron defeated Australian Daniel Ammann by unanimous decision in their 10-round bout.

Cameron, who is eager to take on Green, started strongly, landing some meaningful blows in the early rounds as Ammann relied on defence.

But the 93.7kg Cameron, who has dropped 13kg in recent months and will need to drop almost 10kg more to stand a chance of taking on Green in the future, wore some blows late in the contest and admitted he struggled to adapt to his new weight.

"I didn't find the spark tonight," Cameron said.

"What we're looking for is a fight with Danny Green, that's what we want. We're a step closer to it."

West Australian light welterweight Willie Kickett defeated Jack Asis by unanimous points decision in their six-round bout.

- AAP