Tyson Fury called out Deontay Wilder in the ring following the American's WBC heavyweight title defence.
The British WBO and WBA world champion was ringside in Brooklyn, New York to see the Bronze Bomber beat Artur Szpilka with a stunning ninth-round knockout.
Once Szpilka was given medical attention and taken from the ring, Fury jumped in and went face-to-face with Wilder.
Watch the Fury-Wilder war of words step up a gear by playing the video at the top of the page...