Oleksandr Usyk has playfully called Tyson Fury 'greedy belly' ahead of their rematch later this year.
The two men recently played out a classic in Saudi Arabia, with Usyk winning via split decision after the bout went the full 12 rounds.
Fury and Usyk will meet for a second time later in the year, with the duo primed to lock horns on December 21.
And Usyk has now playfully mocked his rival, branding him 'greedy belly' while also comparing him to sparkling water.
Boxing news: Oleksandr Usyk has branded Tyson Fury 'greedy belly' ahead of their rematch later this year
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He told Three Knockdown Rule. "Anthony Joshua has classy boxing.
"Greedy Belly, my friend Tyson Fury. It’s like sparkling water, when you open it without shaking it’s good.
"If you shake it, it [blows]. Sparkling water is Tyson Fury and still water is Anthony Joshua.
"Tyson’s arms are like two metres, like a rope."
While Usyk was able to beat Fury, the 37-year-old had to make plenty of sacrifices on his way to becoming heavyweight champion of the world.
The Ukrainian missed family birthdays due to being in camp and is currently taking a break from the sport.
Usyk was asked if Fury was the toughest fight of his career.
And while the heavyweight star agreed with that assessment, he did say Fury wasn't the biggest puncher he's battled against.
"I would say toughest fight, yes, but I think biggest punch, no," he said.
When asked who is the most-powerful puncher he's faced, he said: "Derek Chisora, very tough guy.
"With Derek, I don't remember which hand if it was left or fight but I would block it and it would be like a baseball bat. It was very dangerous."
Usyk has also revealed he's keen to return to the cruiserweight division at some point.
"I think maybe after the rematch, I am going to go down in weight to cruiserweight. I want more [fights at] cruiserweight," he said.
"Maybe I can be undisputed for a second time in the cruiserweight division, it's my plan.
"When I start to prepare for my training camp [as a heavyweight], I have to eat all the time.
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"For me it's hard, I don't like it."
Meanwhile, Jai Opetaia has revealed he's eager to fight Usyk - insisting it would be a dream come true.
"I would love to fight Usyk," he said. "I've watched Usyk for a long time.
"I was a 17-year-old kid at the Olympics in London in 2012 and he won the Olympics.
"I've always been in the shadows, I've always been very close and now I'm starting to roll into my prime.
Boxing news: Tyson Fury was left bloodied and bruised after losing to Oleksandr Usyk last month
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"I'm not a little kid anymore. Now they know. I'm on their radar. It's a good feeling.
"He's always been at the top of where I was at. He's always been the No 1 seed, so to get a fight with him - I would love that."