New York - Late tonight, fans will be treated to a unification battle, as super-middleweight supremacy will be on the line when World Boxing Council champion Badou Jack and International Boxing Federation title-holder James DeGale clash in New York.

And there's no shortage of confidence in either camp ahead of the showdown that's been in the works since both posted victories in Washington in April. 

But in DeGale, the first Briton to win both Olympic gold and a professional world title, Jack faces a fighter who has proved himself a road warrior.

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DeGale's most recent three victories have all come in North America -- a streak he is confident of extending.

DeGale believes Jack may be underestimating him, based on what he admits was a lackluster performance in a unanimous decision win over Rogelio Medina in Washington DC -- on the same card on which Jack retained his WBC belt with a controversial majority draw against former champ Lucian Bute -- a decision Jack dismissed as "Bullsh*t".

Jack has rebuilt his career after a crushing first-round knockout loss to Derek Edwards in 2014.

He won his first world title with a victory of Anthony Dirrell in 2015 and Mayweather says Jack has come a long way since that shocking 2014 defeat.

On the undercard, Mayweather Promotions rising star Gervonta Davis (16-0, 15 knockouts) challenges unbeaten Jose Pedraza for the Puerto Rican's IBF super featherweight title.

Pedraza, 22-0 with 12 knockouts, is making the third defense of the title he claimed in 2015.