Former IBF heavyweight champion 'Prince' Charles Martin is still hungry to get some payback on his former foe Anthony Joshua, according to Martin's manager Mike Borao.

Martin is scheduled to take part in an IBF world title eliminator, against the very dangerous Luis Ortiz, on January 1 in Florida. The fight will headline a Fox Sports Pay-Per-View card.

Joshua captured his first world title when he blew away Martin in two rounds to capture the IBF belt in 2016.

Back in September, Joshua lost his IBF, IBO, WBA, WBO titles when he was outboxed by Oleksandr Usyk over twelve rounds.

A rematch between Joshua and Usyk is being targeted for the first quarter of 2022.

"I think Usyk beats Joshua again, but I am rooting for Joshua," Borao told Sky Sports.

"Charles desperately wants to fight and KO Joshua before he retires. He's been focused on that singular goal since 2016 - it's what motivates him and it's the reason why he will beat Luiz Ortiz. Charles will do whatever it takes to become two-time heavyweight champion, including fighting a second IBF eliminator against one of the most avoided heavyweights in the world.

Martin secured the fight with Ortiz after failing to land fights with Andy Ruiz and Dillian Whyte.

"Charles instructed me to match him against the only fighter to KO Joshua, Andy Ruiz," said Borao.

"I tried very hard to make a fight against Andy, but he refused. We also tried to make the fight against Dillian with no success - and thank goodness, given his most recent withdrawal [from the Otto Wallin fight due to injury].

"Once Charles gets past Ortiz, people will realize his dedication and desire to reclaim his title. Charles turned pro with me 10 years ago, and I have never seen him more focused than he is right now."