UFC 146: Junior Dos Santos stops Frank Mir

Frank Mir begins to fall to the mat after Junior Dos Santos landed a punch to his head in the second round of their UFC heavyweight title fight on Saturday night in Las Vegas.   (Julie Jacobson / Associated Press)

Junior Dos Santos celebrates after defeating Frank Mir by technical knockout in the second round of their UFC heavyweight championship fight on Saturday night in Las Vegas.   (Julie Jacobson / Associated Press)

Junior Dos Santos prepares to be interviewed after beating Frank Mir by technical knockout in the UFC heavyweight title bout on Saturday night in Las Vegas.   (Julie Jacobson / Associated Press)

Cain Velasquez takes down Antonio Silva during their UFC heavyweight fight on Saturday night in Las Vegas.   (Julie Jacobson / Associated Press)

Cain Velasquez sends Antonio Silva to the mat with a takedown during their UFC heavyweight fight on Saturday night in Las Vegas.   (Julie Jacobson / Associated Press)

Blood streams from wounds on the face of Antonio Silva as he battles Cain Velasquez in a UFC heavyweight fight on Saturday night in Las Vegas.   (Julie Jacobson / Associated Press)

Antonio Silva receives medical attention after losing to Cain Velasquez (background) in a bloody heavyweight fight on Saturday night in Las Vegas.  (Julie Jacobson / Associated Press)

Lavar Johnson delivers punches from on top of Stefan Struve in the first round of their heavyweight fight on Saturday night in Las Vegas.  (Julie Jacobson / Associated Press)

Stefan Struve celebrates after forcing Lavar Johnson to submit from an arm bar in the first round of their UFC heavyweight fight on Saturday night in Las Vegas.   (Julie Jacobson / Associated Press)

Shane Del Rosario lands a kick against Stipe Miocic in the second round of their UFC heavyweight bout on Saturday night in Las Vegas.   (Julie Jacobson / Associated Press)

Stipe Miocic rams his arm into the head of Shane Del Rosario in the second round of their UFC heavyweight fight on Saturday night in Las Vegas. Miocic would eventually win by knockout.   (Julie Jacobson / Associated Press)

Diego Brandao has the upper hand against Darren Elkins in their UFC featherweight fight on Saturday night in Las Vegas. Elkins would rally to win by unanimous decision.   (Julie Jacobson / Associated Press)