Amir Khan always runs his mouth. He should have SERIOUSLY learnt by now that shouting your mouth off about knocking people isn;t a great idea, especially with a softer chin than most.
Brooks opposition may not be the very top, but in Carson Jones, he fought a very good welterweight who is, IMO, a similar fighter to Lamont Peterson but better. I think Brook stops Khan 9 times out of 10.
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