It appears that all four heavyweights have agreed to participate in the IBF's tournament to determine a mandatory challenger for their champion, Wladimir Klitschko. According to Dan Rafael, Calvin Brock (31-1, 23 KOs) will face Eddie Chambers (29-0, 16 KOs) in the main event of a ShoBox card on November 2. In the other bracket, Chris Byrd (40-3-1, 21 KOs) is close to a deal to face Olympic gold medalist Alexander Povetkin
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