UFC 166 open workout photos Cain Velasquez attempts a single leg on Daniel Cormier during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Cain Velasquez pummels with Daniel Cormier during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Daniel Cormier and Cain Velasquez pummel during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Daniel Cormier and Cain Velasquez pummel during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Cain Velasquez practices a single leg takedown during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Cain Velasquez practices takedown defense during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Daniel Cormier attempts a single leg takedown on Cain Velasquez during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Daniel Cormier shadowboxes during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Cain Velasquez talks to the media during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Roger Clemens and Cain Velasquez pose for pictures during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Junior dos Santos poses for a picture during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

`UFC 166 open workout photos Junior dos Santos wraps his hands during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Junior dos Santos shadow boxes during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Junior dos Santos talks to the crowd during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Junior dos Santos hits pads during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Junior dos Santos winds up on a big punch during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Junior dos Santos does a hand stand during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Junioe dos Santos talks to the media during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Junior dos Santos signs autographs during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Roy Nelson shadow boxes during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Roy Nelson stretches during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Roy Nelson shadow boxes during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Roy Nelson throws an uppercut during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Roy Nelson throws a roundhouse kick during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Roy Nelson throws a front kick during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Roy Nelson signs autographs during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Gilbert Melendez poses for a picture during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Gilbert Melendez shadow boxes during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Gilbert Melenez shadow boxes during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Gilbert Melendez shoots a double leg takedown during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Gilbert Melendez level changes for a takedown during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Diego Sanchez poses for a picture during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Diego Sanchez practices his shot during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Diego Sanchez throws a high jab during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Diego Sanchez throws a left hook during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.

UFC 166 open workout photos Diego Sanchez hits Thai pads during the UFC 166 open workouts at the House of Blues on Wednesday, October 16, 2013.