In short:

Australia's Liam Wilson was set to fight American Stephen Fulton on the Tim Tszyu versus Errol Spence Jr card.

The American weighed in almost 4.5kg over the originally agreed fight weight, forcing the bout to be scrapped.

What's next?

The Tim Tszyu fight is set to get underway from about 1:30pm (AEST) on Sunday.

Luckless Australian boxer Liam Wilson has been dealt another cruel blow, with his scheduled world title eliminator against Stephen Fulton cancelled after the American failed to make weight.

In farcical scenes, Fulton hit the scales at almost 63.5kg on Saturday, almost 4.5kg more than the two-division world champion was originally supposed to fight Wilson at in Sydney.

Fulton and Wilson were supposed to square off at the super-featherweight of 59kg before officials on Friday raised the weight to 60.3kg for the feature bout on the blockbuster Tim Tszyu-Errol Spence Jr card.

Wilson had happily agreed to the late change, saying he was desperate to earn another world title shot with a victory over the former unified super-bantamweight world champion and ex-WBC featherweight belt holder.

But now the American's team is being accused of never truly intending to fight on Sunday.

"This feels like a stitch-up," Wilson's manager and Tszyu's ex-agent Glenn Jennings said.

"If you are serious and you sign a contract at 133 [pounds], there is an expectation that you will deliver.

"It is not only unacceptable, it is a blight on the sport. This is unprofessional, there is nowhere to go for this bloke now."

Undefeated Olympian Paulo Aokuso will move to the main card, taking on Luis Tejeda from the Dominican Republic in a light-heavyweight bout.

Wilson's fight is the second co-main event to be cancelled this week after Fulton's fellow American Jermall Charlo was denied a visa to face rising Australian Koen Mazoudier.

AAP