Photos: Canelo Alvarez vs. Amir Khan

Canelo Alvarez lands a jab to the face of Amir Khan during their WBC middleweight championship bout on Saturday in Las Vegas.

Amir Khan lands an overhand right against Canelo Alvarez during their WBC middleweight title fight at T-Mobile Arena.

Canelo Alvarez, left, and Amir Khan trade punches during their WBC middleweight championship bout in Las Vegas on May 7.  (Isaac Brekken / Associated Press)

Canelo Alvarez lands a right to the body of Amir Khan during their WBC middleweight title fight Saturday at T-Mobile Arena.

Canelo Alvarez tries to evade a punch by Amir Khan during their WBC middleweight championship fight on Saturday.

Canelo Alvarez lifts Amir Khan off his feet during a clinch in their WBC middleweight title fight at T-Mobile Arena on Saturday.

Amir Khan works to the body of Canelo Alvarez during their WBC middleweight title fight on Saturday night in Las Vegas.

Canelo Alvarez sends Amir Khan reeling with a knockout punch during their WBC middleweight title fight Saturday.

Amir Khan falls to the canvas after getting knocked out by Canelo Alvarez in the sixth round of their WBC middleweight title fight Saturday night in Las Vegas.

Amir Khan is counted out by the referee after getting knocked out by Canelo Alvarez in the sixth round of their WBC middleweight title fight Saturday at T-Mobile Arena in Las Vegas.

Canelo Alvarez celebrates his knockout victory over Amir Khan with his team on Saturday night in Las Vegas.