Amir Khan

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10ThingstoSeeSports - England's Amir Khan, left, crumbles to the mat after receiving a low blow from Luis Collazo, right, in their silver welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. Referee Vic Drakulich is at center. Khan went on to win by unanimous decision. (AP Photo/Isaac Brekken, File)

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England's Amir Khan, right, raises his arms in victory at the end of his silver welterweight title boxing fight against Luis Collazo, center, Saturday, May 3, 2014, in Las Vegas. Referee Vic Drakulich is at left. Khan won the bout by unanimous decision. (AP Photo/Isaac Brekken)

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England's Amir Khan, left, lands a right against Luis Collazo in their silver welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

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England's Amir Khan is hoisted by his corner after defeating Luis Collazo in their silver welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

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=England's Amir Khan is hoisted by his corner after defeating Luis Collazo in their silver welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

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England's Amir Khan, right, connects with a hard right to the head of Luis Collazo in their silver welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. (AP Photo/Isaac Brekken)

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England's Amir Khan, left, kneels after receiving a low blow from Luis Collazo, right, in their silver welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. Referee Vic Drakulich looks on. Khan went on to win by unanimous decision. (AP Photo/Isaac Brekken)

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England's Amir Khan, left, crumbles to the mat after receiving a low blow from Luis Collazo, right, in their silver welterweight title boxing fight Saturday, May 3, 2014, in Las Vegas. Referee Vic Drakulich is at center. Khan went on to win by unanimous decision. (AP Photo/Isaac Brekken)