Amir Khan believes beating Saul "Canelo" Alvarez would rank as the greatest achievement of his boxing career.
Alvarez will put his WBC middleweight belt on the line against Khan in Las Vegas on May 7 in a catchweight bout.
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Khan is moving up two weight classes from welterweight for the fight. He previously held the unified WBA and IBF light-welterweight titles.
"It's going to be amazing to be called the middleweight world champion and that's like a dream come true," Khan, of Britain, told Sky Sports.