He returned to win the British super-bantamweight title having previously been a British champion at flyweight, as well the Commonwealth title-holder.
The Ukrainian has won 28 of his 31 fights and drew with then title-holder M'baye when the two met in Liverpool last March.
Hobson, who has signed a three-fight deal with American television network HBO, had hoped to announce an opponent for IBF and WBA title-holder Hatton last week.
The troubled Scot, then the WBO title-holder, failed to turn up for the pre-fight weigh-in, leaving Cook, who is undefeated in 27 professional encounters, deflated, angry and out of pocket.
Khan, who was desperate to impress and earn a crack at American WBO title-holder Nate Campbell or interim belt holder Joel Casamayor, said the fight was just what he needed.
One-time IBF super-featherweight title holder St Clair, 32, has never been stopped in his 46-fight career.
The ex-WBC title holder's manager Don King is talking with Maccarinelli's promoter Frank Warren about the deal.
The 25-year-old title holder Quigley said before the fight he was happy to be the "underdog" but remained confident after beating Tony Dodson over 12 rounds to win the title seven months ago.
Perhaps in a few years after the record-breaking perennial title holder Tony McCoy has hung up his whip.
Kenya's 20-year-old world 5, 000m title holder Eliud Chepchoge, who was second last year in Newcastle, agreed to run earlier this week.
English title holder Dodson also claims to be in top shape as the build-up to his clash with 'The Cobra' begins in earnest.
Jean Pascal is WBC champion and Beibut Shumenov the WBA title holder, while if Braehmer fails in his appeal against a 16-month prison sentence for assault and insulting behaviour the winner of Cleverly and Murat will replace him as WBO king.
The event offers a brand-new Porsche sports car, parked at the side of the court, to the title holder come Sunday.
The Helenius-Gammer fight was set to take place on the undercard of the WBA heavyweight title bout between holder Nikolay Valuev and Ruslan Chagaev.
And tough Korean Injin Chi, the WBC title holder, is being tailed by Scotland's Scott Harrison, a proposition not for the faint-hearted.
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