Cheavon Clarke rejects Chris Billam-Smith handshake at face-off ahead of Saturday's fight at Copper Box Arena

Chris Billam-Smith fights Cheavon Clarke in the headline event of Zuffa Boxing 12 at the Copper Box Arena on Saturday; Denzel Bentley meets Shane Mosley Jr with DaMazion Vanhouter and Sam Hickey in action; Watch Zuffa Boxing 12 on Saturday live on Sky Sports