Kell Brook suffered a brutal defeat at the hands of a ruthless Terence Crawford to leave the Brit's career in the balance.
The Sheffield star's bold bid to take on WBO welterweight champion ended in the fourth round.
Brook, 34, had started well in the fight with his jab an effective weapon but three-weight world champion Crawford was just biding his time.
The American knew his chance would come and a stiff jab from the southpaw sent Brook crashing into the ropes.
It was the first punch of note to land on the Brit but it all-but ended the clash in the MGM Grand 'bubble' in Las Vegas.
Brook fought on after referee Tony Weeks ruled it a knockdown as the ropes kept him up.
But Crawford was clinical as he landed a number of shots flush on Brook, who had not recovered.
Weeks stepped in to save the Brit as the flurry ended with a sharp right hook.
“This is boxing, I got caught with a shot I didn't see,” said Brook.
“The referee waved it off and that has never happened before. I always said I would go out on my shield.”
The Sheffield welterweight has now suffered three defeats in his 42-fight career.
The last? Quite possibly.
It is hard to see where Brook can go from here after a long career which started in 2004.
The highlight was his 2014 win over Shawn Porter when he became IBF welterweight champion in America.
But this Brook is no longer that fighter as Crawford joined Gennady Golovkin and Errol Spence Jnr in beating the Brit.
He can take some comfort by the fact he was beaten by one of the best on the planet and all his career defeats have been against elite fighters.
But it is a long road back now and after campaigning at light-middleweight for three years but making little progress in the higher division.
He did start well in his first fight at welterweight since that 2017 defeat by Spence Jnr.
Brook's jab was giving the unbeaten Omaha fighter something to think about.
The Sheffield fighter, who came into the fight without long-time trainer Dominic Ingle, won the first two rounds and maybe even the third but Crawford was just finding his range.
When the three-weight world champion found it in the fourth round, it was devastating.
Brook was stunned, he didn't see the shot coming and looked dazed as Weeks asked him if he wanted to fight on.
Crawford was ruthless as he moved in, finally really letting his hands go with vicious swings landing and Brook was defenceless before the bout was waved off.
The American put forward another example as to why he is one of the best on the planet as he notched his 28th stoppage victory in 37 career wins.
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