We've never seen anything like this before.
Fans got two fights for the price of one as Juan Manuel Lopez took on his bitter rival Wilfredo Vazquez Jr in Puerto Rico.
Lopez won the fight with a sensational 11th-round knock out of Vazquez Jr in the grudge match on Saturday night.
But as the 33-year-old fighter was celebrating the KO victory, his rival's cornerman jumped into the ring and the two men went for each other.
Lopez let rip with a left hook and the cornerman landed a short left hand on the boxer before a brawl ensued.
The two men were wildly swinging punches at each other before they were pulled apart by fight officials at the Roberto Clemente Coliseum.
https://twitter.com/GrabakaHitman/status/792575497699983361?ref_src=twsrc%5Etfw
It was always going to be a feisty encounter between former WBO featherweight world champion Lopez and Vazquez Jr, who once held the WBO super bantamweight strap.
Things got heated in the pre-fight press conference and it almost came to blows before the pair had made it into the ring.
The two Puerto Ricans slugged out an absolute war in front of their countrymen with Vazquez Jr outboxing his opponent early on.
Lopez's power and pressure then began to tell as the fight wore on and it was a sweet left-right combo which finally dropped his rival to the canvas before the referee stopped the fight.
But the brawl after the fight was stopped was truly astonishing. It looked like things were going to turn even more ugly after the two men were pulled apart as the crowd were hurling bottles and missiles into the ring.
But Lopez and Vasquez Jr then went on to embrace each other in the ring as order was restored.
Here is the knock out and the melee that ensued after fight...
https://www.youtube.com/watch?v=1n7_MKw4D6c&feature=youtu.be
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