Bookmakers made Mikaela Mayer a big favorite against Mary Spencer when they meet in their bout on Thursday 30th October 2025 at Montreal Casino, Montreal, Canada.
She is currently 1/5 (-500) to win the bout outright, while you can get 7/2 (+350) on Mary Spencer if you fancy the big upset.
That means that oddsmakers think there is 79% chance of Mayer winning while giving Spencer a 21% chance.
Mayer opened as the favorite at 2/11 (-560).
Spencer opened at 7/2 (+350).
The fight is scheduled for 12 rounds in the Super Welterweight division, which means both fighters will have to make the weight limit of 154 pounds (10.78 stones or 70 kg) on the day of the weigh-in.
Spencer vs Mayer Head To Head
Mary Spencer steps into the ring with a record of 10 wins, 2 losses, and 0 draws, 6 of those wins coming by way of knockout.
Mikaela Mayer will make her way to the ring with a record of 21 wins, 2 losses and 0 draws, with 5 of those wins by knockout.
The stats suggest Spencer has a massive power advantage over Mayer, boasting a 60% knockout percentage compared to Mayer's 24%.
Mary Spencer is the older woman by 5 years, at 40 years old.
Spencer has a height advantage of 2 inches over Mayer.
Both Mary Spencer and Mikaela Mayer fight out of an orthodox stance.
Spencer is the less experienced professional fighter, having had 11 fewer fights, and made her debut in 2021, 4 years later than Mayer, whose first professional fight was in 2017. She has fought 116 fewer professional rounds, totaling 58 compared to Mayer's 174.
Spencer vs Mayer betting form
Mikaela Mayer has beaten 4 of her last 5 opponents.
In her last fight, she won against Sandy Ryan on March 29, 2025, by unanimous decision in their 10 round contest at Fontainebleau Las Vegas, Las Vegas, United States. She was a 23/25 (-110) underdog going into the contest.
Prior to that, she had won against Sandy Ryan on September 27, 2024, by majority decision in their 10 round contest at Madison Square Garden, New York. She was a 1/1 (+100) underdog going into the contest.
Going into that contest, she had been beaten by Natasha Jonas on January 20, 2024, by split decision in their 10 round contest at M&S Bank Arena, Liverpool, United Kingdom. She was a 1/1 (+100) underdog going into the contest.
Before that, she had beaten Silvia Bortot on September 2, 2023, by points in the 10th round at Manchester Arena, Manchester. She was a 1/25 (-2500) favorite going into the contest.
She had defeated Lucy Wildheart on April 15, 2023, by unanimous decision in their 10 round contest at Copper Box Arena, London. She was a 1/30 (-3000) favorite going into the contest.
Who's been more active?
Mayer's last 5 fights have come over a period of 2 years, 6 months and 15 days, meaning she has been fighting on average every 6 months and 4 days. In those fights, she fought a total of 50 rounds, meaning that they have lasted 10 rounds on average.
What’s the Latest Time I Can Bet on Spencer vs Mayer Pre Fight?
The fighters are expected to ringwalk at around 4:00 AM UTC at Montreal Casino, Montreal, Canada, which is 12:00 AM EST or 9:00 PM PST on the West Coast of America, or 4:00 AM GMT in the UK.
