Junior middleweight Tim Tszyu has made good on his promise to stay busy.

As BoxingScene.com previously reported, Tszyu will make a defense of the interim-WBO junior middleweight title against Carlos Ocampo on June 18 in Queensland, Australia.

He was initially scheduled to have his mandatory shot at undisputed champion Jermell Charlo - but the fight was postponed when Charlo suffered a hand injury.

The hand injury has continued to play out, with Tszyu forced to take another contest while waiting to face Charlo.

"So [the Charlo brothers] don't like to fight," Tszyu told Fox Sports Australia. "I know they call themselves lions, but really they're a bunch of … I dunno … they just don't do anything.

"Which isn't how lions act, let's just say that. [Jermell Charlo] is on the decline. I'm on the incline. And by the time we fight, the difference will be shown."

Tszyu also lashed out at domestic rival Michael Zerafa.

While waiting for a new date with Charlo, there was talk that Tszyu's handlers approached Zerafa for a fight.

Zerafa was in line for a crack at WBA middleweight champion Erislandy Lara, but took a step-aside fee to allow the Cuban champion to make a voluntary defense against Danny Garcia.

"That just shows his character, shows exactly the type of person he is. He's a fraud," said Tszyu.

"There's no way I'd ever step away from a world title fight. But in saying that, the only fighters who get offered step aside money are those who aren't relevant. Fighters who aren't important, the ones nobody cares about. I dunno how much he took. But that bloke would accept 500 bucks."