BBC Sport looks back at some of Callum Simpson’s best knockout moments in the ring as he prepares to defend his European, British and Commonwealth super-middleweight titles against Troy Williamson.
Follow coverage of Simpson v Williamson live on BBC Three from 19:30 GMT and on BBC iPlayer and BBC Sport website and app from 17:30 on Saturday, 20 December.
READ MORE: For four days, I didn’t know if my family was alive – Williamson
Pictures courtesy of Boxxer.
