Deontay Wilder says he has "transformed into a killer" before his world title fight with Tyson Fury in Los Angeles.
Wilder and Fury meet on 2nd December in what will be just the third bout of Fury's comeback since he vacated his WBO and WBA titles to focus on treatment for depression.
WBC heavyweight champion Wilder who is unbeaten in 40 fights also said Anthony Joshua was "a coward".
In June, a potential fight with WBA, IBF and WBO champion Joshua was set back after Joshua was ordered to face Alexander Povetkin by the WBA.
Deontay Wilder will face Tyson Fury on Sunday 2nd December.
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