Tszyu won't rest in quest to become undisputed champion

Tim Tszyu won't be putting his feet up for long as he hunts more silverware, intent on making his family the most successful in boxing history.

The 28-year-old shunned a big celebratory party in favour of a quiet BBQ with friends, and will now head overseas for a short holiday following his nine-round demolition of Tony Harrison in Sydney on Sunday to collect the interim WBO super-welterweight belt.

Tszyu said there was more work to be done.

"Usually, I'm pigging out but this time I was not too bad - I had a nice little healthy breakfast this morning," Tszyu said on Tuesday.

"I know what's on the horizon and I don't want to start pigging out and start getting excited with things.

"I feel like it's an achievement - it feels great waking up and I've got this belt that says world champion in front of me.

"It's pretty cool but there's a lot more to go - I want all four belts."

Tszyu is already salivating over his next fight, planning to take on undisputed champion Jermell Charlo in Las Vegas with a July date pencilled in.

Originally set down for January before the American broke his hand, the Australian said his win over Harrison had got the fight world's attention.

"The fight with Charlo is definitely now a bigger fight for sure," said Tszyu, who is unbeaten in 22 professional fights with 16 knock-outs.

"The whole world knows about it, and everyone's commentating on it, and everyone's got their own opinion, so it does make the fight bigger.

"Of course I gained way more knowledge. I was able to go another prep, to go through fight week and all this is invaluable experience for what's ahead."

Charlo wasn't impressed by Tszyu's performance, describing the Australian as "flat" and pledging to shut him up when the pair finally meet.

The Sydneysider, who plans to relocate to the US to prepare for the fight, brushed off the sledge.

"It's just the pre-prep talk anyway," he said of Charlo's comments.

"I wasn't the one that was stuttering my words anyway, it was him."

Tszyu's famous boxing father Kostya didn't make fight night in Sydney - where Tim's young brother Nikita also won - due to a family illness in Russia but the pair spoke after the triumph.

"Dad said, 'Good, job, well done, you made a couple of mistakes though' ... Far out man - haters going to hate," Tszyu laughed.

"Nah, we caught up and he was really happy, it was a big moment for him as well.

"The goal now is to be the best boxing family that ever lived."

Tszyu himself conceded there were mistakes made in the Harrison fight that he would learn from.

He said he could seek out Harrison, who beat Charlo in 2018, for tips.

"I could - he's a very talented fighter ... I could learn a lot from his tips," he said of Harrison.

"There were a lot of mistakes made but a lot of good things as well but at the same time I had one of the highest-IQ calibre opponents out there.

"With the calibre of opponent I had, I did not too bad a job."