But Tszyu dreams of taking Brian Castano's WBO light-middleweight belt from the Argentine in Las Vegas after placing his divisional kings on notice with a brutal beat-down of Takeshi Inoue.

"The boys want to do it here, but I wouldn't mind going there (to Vegas)," Tszyu said after extending his undefeated professional record to a 20-0 with a unanimous points decision on Wednesday night.

"I think it should be taken to the States and then brought back here. The right way.

"It's always been a dream of mine, as a young kid growing up watching boxing on the big screen, to go to the States."

While fearing Castano may be reluctant to take on Tszyu following the mandated top-ranked challenger's latest masterclass, Tszyu's manager Glen Jennings says the South American can't hide for much longer.

"We're really hopeful and excited by the prospect that it may well be Brian Castano for the world title next," Jennings said on Thursday.

"It's just really a matter of time now. It could be any day that we get a decision and, right now, the team - (trainer) Igor (Goloubev) and all of us - feel that Tim's ready."

Tszyu certainly feels ready.

"Finish your honeymoons, get in the gym, start training, because I'm coming for all of you. Every single one of you," he declared after retaining his WBO Global and WBO Asia-Pacific super-welterweight titles with a comprehensive win at Qudos Bank Arena.

No Limit Boxing promoter George Rose is adamant Tszyu is a world champion in waiting and hopes the Sydneysider can claim the crown in front of his growing legion of home fans.

"We've shown we're capable of hosting that calibre of event here and we're pushing as hard as we possibly can to make that happen," Rose said.

As ever, though, it wouldn't be boxing if there wasn't a catch that could delay Tszyu his long-awaited shot at Castano.

The WBO champion is trying to negotiate a rematch with WBC, WBA and IBF belt holder Jermell Charlo early next year after their unification bout in Texas in July ended in a controversial split draw.

But clouding that rematch is the IBF's insistence that Charlo defends his belt against mandatory challenger Bakhram Murtazaliev.

"We're expecting one of the divisions make Charlo fight Murtazaliev in January," Jennings said.

"If that happens, the WBO will most likely follow suit and say, 'OK, Castano, you now have to fight Tim, and that's what we're hoping for and that should be pretty soon.

"The only murky waters here is the rematch. Let's be honest, if those boys sat and watched what Tim did in 12 rounds like that, they're probably thinking it's an easier option than to take the mandates."

But Jennings is adamant a world-title shot for Tszyu is now non-negotiable.

"That's why they have mandates and that's why associations have their own by-laws, so they must enforce them within a certain time frame," he said.

"Make no mistake, if (the Castano fight) was to fall over, Tim would be fighting again in February and March regardless. We won't wait for them.

"Castano is digging his heels in. He doesn't want to come to Australia, he wants it in America.

"It'll either be Castano or someone else."

Australian Associated Press