Kendall Holt came from off the canvas to claim a thrilling first round victory over Ricardo Torres and claim the WBO light-welterweight title in Las Vegas.
Holt was on his pants after just 20 seconds when a right hand from Torres hit the spot, and he went down a second time moments later with Torres moving in for the kill.
The champion was fortunate not to be deducted a point for attempting to hit Holt as he tried to stand up, but it would hardly have mattered.
Holt managed to regroup and a fierce left to the body opened up the careless Torres, who found himself sprawling between the ropes after his opponent followed up with a looping right hand that had referee Jay Nady calling an abrupt end to the contest.
Torres had lost to then-champion Miguel Cotto three years ago but has held the title since 2006 and had stopped Holt late on in his most recent defence last September.
But it was payback time for the American, who was ahead on two of the scorecards in Torres' hometown of Barranquilla when he suffered a controversial technical knockout in the 11th round of their opening match.
Holt's victory takes him to a record of 24-2 with Torres now 32-2.

Bring on the Klitschkos!
David slays Goliath
McCloskey v Rasillav - Luck of the Irish
Watt backs Haye for victory in Nuremberg
McCloskey v Rasillav
Behind the scenes with Valuev
David and Goliath preview
KO or bust for Booth
Book David and Goliath at home and you could win a pair of the Hayemaker's official fight shorts...
We look back at what David Haye, Nikolai Valuev and just about anyone else has said about their showdown.
It's time for The Truth, as we assess the weigh-in and all the options on the eve of David and Goliath...