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, 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)
