Charles Martin knocked out Gerald Washington in dramatic fashion on the Deontay Wilder vs Tyson Fury undercard.
The former IBF champion was dethroned by Anthony Joshua in 2016, but is now once again on the comeback trail.
After six unentertaining rounds, one single left hand ended proceedings.
The bout was an IBF eliminator which means Martin is now one step closer to a second shot at the title after this victory.
During his first reign, he was only champion for 85 days.
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Martin won the belt when his opponent Vyacheslav Glazkov suffered a knee injury.
He then took a big payday to defend against AJ and was knocked out in two rounds at the O2 Arena.