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WBC champion Tyson Fury produced a stunning one-punch stoppage in the sixth round to beat fellow Briton Dillian Whyte and then insisted he will retire from boxing.
Fury dominated what was a scrappy bout and then unleashed a vicious right uppercut.
Whyte, admirably, got to his feet within the count before staggering into the referee as the fight was halted.
"This might be the final curtain for the Gypsy King," Fury said post-fight.
He added later: "I've spent a lot of time on the road. I've been away for a long time. I fulfilled everything I've ever wanted to fulfill.
"I will retire as only the second heavyweight in history, after Rocky Marciano, to retire undefeated. I was unbeatable at this game."