Dalton Smith secured the Lonsdale belt at 140lbs outright when he moved past Sam Maxwell on Saturday night.
The 26-year-old also took Maxwell's Commonwealth strap and he will hope to move onto bigger things.
He was spurred into action when he suffered cuts over both eyes, and he stepped up to deliver a thrilling knockout.
Smith waited to be sure that Maxwell was not in any danger before starting the celebrations, and you can watch it all back on DAZN.
The card is streaming on DAZN in over 200 countries across the globe (except Australia and New Zealand). You can sign up for a subscription here .
However if you are in Argentina, Chile and Colombia you must download the DAZN app from the Apple App Store or Android Google Play store and then sign up from there, rather than via web browser.
DAZN is available on web browsers at DAZN.com (except Argentina, Chile and Colombia) and also has apps available for all of the following TV and streaming devices:
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The fight took place at the Utilita Arena in Sheffield, England.