Bookmakers made Callum Simpson a big favorite against Troy Williamson when they meet in their bout on Saturday 20th December 2025 at Leeds, United Kingdom.
He is currently 1/5 (-500) to win the bout outright, while you can get 7/2 (+350) on Troy Williamson if you fancy the big upset.
That means that oddsmakers think there is 79% chance of Simpson winning while giving Williamson a 21% chance.
Simpson opened as the favorite at 1/5 (-500).
Williamson opened at 7/2 (+350).
The fight is scheduled for 12 rounds in the Super Middleweight division, which means both fighters will have to make the weight limit of 168 pounds (11.76 stones or 76.36 kg) on the day of the weigh-in.
Simpson vs Williamson Head To Head
Callum Simpson steps into the ring with an undefeated record of 18 wins, zero losses, and 0 draws, 13 of those wins coming by way of knockout.
Troy Williamson will make his way to the ring with a record of 21 wins, 4 losses and 1 draw, with 15 of those wins by knockout.
The stats suggest Simpson has a slight advantage in power over Williamson, with a 72% knockout percentage compared to Williamson's 71%.
Callum Simpson is the younger man by 5 years, at 29 years old.
Simpson has a height advantage of 4 inches over Williamson. This also extends to a 2-inch reach advantage.
Both Callum Simpson and Troy Williamson fight out of an orthodox stance.
Simpson is the less experienced professional fighter, having had 8 fewer fights, and made his debut in 2019, 2 years and 7 months later than Williamson, whose first professional fight was in 2016. He has fought 92 fewer professional rounds, totaling 77 compared to Williamson's 169.
Callum Simpson goes into the fight ranked number 7 by the WBA, 11 by the WBC, 10 by the WBO, and 5 by the IBF at super middleweight.
Simpson vs Williamson betting form
Simpson remains undefeated as a professional, stopping 4 of his last 5 opponents.
In his last fight, he won against Ivan Zucco on June 7, 2025, by technical knockout in the 10th round at Oakwell Football Ground, Barnsley, United Kingdom. He was a 3/25 (-830) favorite going into the ring.
Prior to that, he had won against Elvis Ahorgah on February 1, 2025, by technical knockout in the 5th round in their CBC Commonwealth Super Middleweight championship fight at Wembley Arena, Wembley. He was a 1/50 (-10000) favorite going into the ring.
Going into that contest, he had beaten Steed Woodall on January 11, 2025, by technical knockout in the 2nd round in their BBBOC British Super Middleweight and CBC Commonwealth Super Middleweight championship fight at Park Community Arena, Sheffield. He was a 4/25 (-590) favorite going into the ring.
Before that, he had defeated Zak Chelli on August 3, 2024, by unanimous decision in their BBBOC British Super Middleweight and CBC Commonwealth Super Middleweight championship fight at Oakwell Football Ground, Barnsley. He was a 3/10 (-340) favorite going into the ring.
He had won against Abdallah Paziwapazi on March 31, 2024, by knockout in the 4th round at O2 Arena, Greenwich.
Troy Williamson has stopped 2 of his last 5 opponents.
In his last fight, he defeated Mark Dickinson on September 6, 2025, by technical knockout in the 9th round at Rainton Meadows Arena, Houghton-le-Spring, United Kingdom.
Prior to that, he had been beaten by Ishmael Davis on March 23, 2024, by unanimous decision in their 12 round contest at Sheffield Arena, Sheffield. He was a 2/1 (+200) underdog going into the contest.
Going into that contest, he had lost to Caoimhin Agyarko on December 2, 2023, by split decision in their 10 round contest at The SSE Arena (Odyssey Arena), Belfast. He was a 5/4 (+130) underdog going into the contest.
Before that, he had been beaten by Josh Kelly on December 2, 2022, by unanimous decision in their BBBOC British Super Welterweight championship fight at Utilita Arena, Newcastle. He was a 91/100 (-110) favorite going into the contest.
He had defeated David Benitez on September 17, 2022, by technical knockout in the 6th round at Bolton Whites Hotel (De Vere Whites), Bolton.
Who's been more active?
If you think ring rust and activity is a big factor in this fight, Callum Simpson has been fighting more than Troy Williamson.
Callum Simpson last fought 6 months and 13 days ago, while Troy Williamson's last outing was 3 months and 14 days ago.
Simpson's last 5 fights have come over a period of 1 year, 8 months and 19 days, which means he has been fighting approximately every 4 months and 5 days. In those fights, he fought a total of 33 rounds, meaning that they have lasted 6.6 rounds on average.
Williamson's last 5 fights have come over a period of 3 years, 3 months and 3 days, meaning he has been fighting on average every 7 months and 26 days. In those fights, he fought a total of 49 rounds, meaning that they have lasted 9.8 rounds on average.
What’s the Latest Time I Can Bet on Simpson vs Williamson Pre Fight?
The fighters are expected to ringwalk at around 10:00 PM GMT at Leeds, United Kingdom, which is 5:00 PM EST or 2:00 PM PST on the West Coast of America.
Where Can I Watch Simpson vs Williamson for In-Play Betting?
Simpson vs Williamson will be broadcast on BBC Two in the UK.
