Kell Brook was sitting ringside when WBO welterweight champion Terence Crawford retained his title over Amir Khan with a technical knockout in the sixth round on Saturday night at Madison Square Garden in New York.

Khan had fallen behind early on, appearing to lose each of the opening three rounds after suffering a knockdown in the first.

A promising start in which his speed troubled Crawford quickly became a struggle to survive after he was hurt by a right hand and then floored by a left.

He appeared to have recovered by the end of the second, but despite occasionally landing is yet to enjoy periods of sustained success.

Khan could no longer continue after a low blow, so he was ruled the loser via TKO after 47 seconds of the sixth.

Brook, who has been feuding with Khan for several years, felt his domestic rival quit. He believes Khan will now finally want to do their long awaited showdown.

"I thought he quit. He had five minutes,’ Brook told AB Boxing News. "He just looked for a way out, he was getting beat in every department. He will [want] to fight me now, he’s got nowhere to go."

Khan has of course denied that he quit.

"First of all I want to apologies to all of the fans. The fight was just getting interesting. Terence was great, I am not taking anything away from him. I have realised why he was one of the best pound for pound. I could feel that punch in the stomach and legs. I have never been hit below the belt and was in pain," Khan said.

"I could feel it in my stomach and legs. I said 'I can't move'. There was no point taking five minutes out, I could not continue. I am not one to give up. I was hit by a hard shot below the belt. I will go and spend time with family and see where I go from there".