Tim Tszyu has landed the highest-profile fight of his career, taking on “The Big Fish” Errol Spence Jr, with the verbal blows between the pair already reaching fever pitch.

Former unified welterweight world champion Spence and Tszyu will square off on Sunday, July 26 in a yet-to-be-named Australian city.

The American superstar (28-1, 22 KOs) is returning to the ring for the first time since his loss to Terence Crawford almost three years ago, while Tzsyu (25-3, 18 KOs) is looking to keep his unbeaten record on home turf intact.

Know the news with the 7NEWS app: Download today Arrow Fronting a heated media conference in Las Vegas to announce the bout after months of negotiations, including a late stand-off before settling on a catchweight of 158 pounds (71.67kg), there was no love lost between the two.

Tszyu said the 36-year-old refused to shake his hand when they initially met up backstage before fronting the cameras.

“I came up to him before and tried to shake his hand — he just walked past me like a disrespectful f***,” Tszyu said.

“That just shows the type of person he is.” That led to a response from Texan Spence.

“I don’t play no games, bro,” the southpaw said.

“I don’t dap up people talking s*** then saying, ‘Hey, buddy, buddy’.

“You wanted to give me a hug, we can hug after the fight.” Tszyu, 31, likened the showdown to his father Kostya Tszyu’s world title win over Mexican champion Julio Cesar Chavez in 2000.

“Back in the day,....