Frank Warren admits Dereck Chisora's credibility is at stake when he meets unbeaten American Malik Scott at Wembley Arena on Saturday
Chisora enters his 21st fight having lost four of his last six contests, leaving him at a pivotal moment of a controversial career that threatens to pass unfulfilled.
Even allowing for the fact he has lost only to Vitali Klitschko, David Haye and Tyson Fury - the latter while he was out of shape - and dropped a highly-dubious decision to Robert Helenius, Warren knows a fifth defeat would be damaging.
