Did Khan have a chin injury or is that just somehow Kell Brook's special move? To go for the opponents chin?
Seems like a typical practice in boxxing anyhow, so is there any need to say anything much about it?
Check Youtube and use the keyword Amir Khan all losses and you'll find out why he is called glass chin most of his losses are coming from punch in the chin, the Canelo fight is very popular because it only took one punch in the chin to knock Khan out and it's a very worrying knock out because he was out in the middle of the air with his head banging in the floor of the ring.
Yeah, he was great until his weakness was exposed. His boxing skills are good but he doesn't have a strong chin so every time he makes a mistake, there's a chance that he will be knocked out, and probably that's the reason why he is the underdog in this fight.