Marco Huck retained his WBO cruiserweight title in Halle on Saturday with a controversial points win over fellow German Firat Arslan.
The reigning champion got the nod 117-111 from one judge at ringside, while the other two both awarded him the bout by a 115-113 margin at the Gerry Weber Stadium.
However, the verdict was greeted by a chorus of boos from the crowd, and former WBA champion Arslan himself was himself furious with the outcome.
"I've never experienced anything like this decision. I've seldom landed so many clean punches and he only scuffed me," he said afterwards.
"How can such a thing happen? This kind of thing is ruining boxing. I landed so many punches. I think the whole crowd believes I'm the winner.
"I've been robbed of my win. I would have been the new world champion today, I would have written history."
The elusive Arslan landed a left uppercut in the second round that had blood coming from Huck's nose, though the challenger did drop the intensity in the closing stages.
Huck, in contrast, pushed hard in the closing rounds, seemingly knowing he needed a strong finish to keep hold of his belt.
"It was hard work, he fought like a lion, worked very hard," the 27-year-old, who could now be set to defend the strap for a third time against Ola Afolabi, said. "I'm not a judge. I think I landed more punches."