"The outcome of the fight was highly, highly dubious," Centrebet spokesman Neil Evans told Fairfax.
"We've never ever in the history of boxing seen so much money go on a specific decision outcome, as in a first or second-round knockout.
"There was a massive go on first or second round knock-out starting from very early yesterday morning, right through the day, certainly up until early afternoon.
"There were hundreds and hundreds of bets of all different shapes and sizes, and a lot of them from Western Australia. There was one bet of $50,000 which is extraordinary on an option of a first-round knock-out, even on a hot favourite.
"They were both into even money, paying $2 each at around lunch-time almost, such was the amount of money just poured in the gate."