Anthony Joshua says Deontay Wilder's refusal to agree to a unification heavyweight world title fight has left him baffled.

Joshua, 30, has been left frustrated in his attempts to lure WBC heavyweight champion Wilder into the ring as he bids to unify the division.

The Brit now holds the WBA, IBF, WBO, and IBO belts following his victory over Andy Ruiz Jr last weekend and is expected to take on Kubrat Pulev or Oleksandr Usyk in his next bout.

But Joshua remains desperate for a mega-fight with Wilder which would see both men attempt to become the first undisputed heavyweight champion since Lennox Lewis.

Anthony Joshua now holds the WBA, IBF, WBO, and IBO belts

"It still puzzles me as to why it's so difficult to pin this man down," Joshua said. "This is the man I need to pin down to get the last ring and conquer this division.

"When he's ready, as I am, I would love to be here talking about Deontay Wilder and the keys to victory.

"It's not about me, it's about the sport and the legacy. If he wants to create his legacy and he wants to be a future hall of famer, he needs to come and see us.

"You've got the two lords of the rings here. The last one to unify, undisputed, the division. I've got four, he's got one. I just need one more."

In the meantime Bulgarian bruiser Pulev is the IBF's next mandatory challenger for Joshua, while the WBO has ordered the Londoner to fight Ukrainian fighter Usyk.

Joshua, 30, has been left frustrated in his attempts to lure Deontay Wilder into the ring

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"Pulev is a very tough athlete," said Joshua. "He knows what he's doing and anyone fighting for the championship is a dangerous fighter. My mindset? Seek and destroy.

"Usyk is a great cruiserweight has moved up to be in with the big boys. He will be in my sights for around March or April, and he's a very credible opponent.

"I want fighters like him on my record. I've been studying him already."

And as for a potential third meeting with Ruiz Jr, the Mexican who stunned the boxing world by beating Joshua in June?

"One trillion per cent," he said. "I always said I'd fight him in Tijuana, with his uncle as referee. Me and Andy will soon see each other in the ring again."