Amir Khan backs Kell Brook's shock decision to fight Gennady Golovkin:

The Sheffield fighter is stepping up two divisions to face the fearsome Golovkin, just a few months after Khan courageously jumped up in weight to battle Saul Alvarez in May.

Khan's brave bid to claim the WBC middleweight title was ended by a sixth-round stoppage defeat to the Mexican and Brook is attempting an equally daunting task by battling the big-punching Kazakh on September 10 at The O2, live on Sky Sports Box Office.

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