A press conference is held in Las Vegas for Saturday\'s pay-per-view undercard to Floyd Mayweather Jr. vs Juan Manuel Marquez.

Chris John defends his WBA featherweight title against Rocky Juarez in a rematch of their controversial February draw.

Lightweights Michael Katsidis and Vicente Escobedo collide for the WBO\'s interim-title.

Featherweights Cornelius Lock and Orlando Cruz will open up the show.

Photos by Chris Cozzone/FightWireImages