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Mikaela Mayer Becomes Three-Belt World Champion in Montreal cover image
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TJ Rives
Oct 31, 2025
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Multi-division, ladies world champion Mikaela Mayer won a three-belt world championship battle at super welterweight easily over Mary Spencer Thursday night in Montreal, Canada.


Mikaela Mayer ventured into hostile territory in Montreal, Canada, and will return to the U.S. as a three-belt world champion after a dominant 10 round victory over Mary Spencer.

The more experienced Mayer (22-2, 5 KOs) outclassed Spencer (10-3, 6 KOs) via a unanimous decision with scores of 100-90, 98-92, and 98-92 and claimed the WBA, WBC, and WBO super welterweight titles. The bout headlined the "Eye of the Tiger" Promotions card Thursday night at the Montreal Casino.

Already the reigning WBO welterweight champion, Mayer now stands as a three-division world champion.

Despite being the smaller fighter on paper, Mayer controlled the ring with a sharp jab and relentless pressure. She found her rhythm early with the straight right hand and later punished Spencer with looping hooks. Spencer, unable to handle the pressure, spent most of the bout retreating and was hurt in the closing rounds.

After the fight, Mayer reflected on her performance and her strategy:

“Usually, I’m the taller fighter, so I know how to beat me. I knew I had to get underneath Mary and come over the top with big hooks — and that’s exactly what we trained for.”

Mayer also spoke about her next steps, emphasizing her versatility and future goals:

“I’ve got options — I can defend my titles at 154 or go back to 147 and become undisputed. After the ups and downs of the past two years, having options is a blessing.”

On Thursday night's undercard:

  • Super Middleweight: Wilkens Mathieu (15-0, 10 KOs) defeated Shakeel Phinn (27-4-2, 17 KOs) via decision (99-90, 98-91, 98-91) and won the NABF & WBC Continental Americas titles at 154 lb.
  • Junior Welterweight: Arthur Biyarslanov (20-0, 16 KOs) downed veteran Sergey Lipinets (18-5-1, 13 KOs) also with an easy decision (99-90, 97-92, 96-93) in defense of his NABF 140 lb. title.
  • Light Heavyweight: Mehmet Unal (14-0, 12 KOs) stopped Ralfs Vilcans (18-3, 7 KOs) at 2:44 and retains the WBC Continental Americas title at 175 lb.
  • Welterweight: Christopher Guerrero (16-0, 9 KOs) began the night beating Williams Andres Herrera (17-5, 7 KOs) easily via decision (99-91, 98-92, 97-93) . He retains the WBC Continental Americas title at 147 lb..

Back to Mayer. The former U.S. Olympian's decisive win cements her status as one of boxing’s elite female fighters  and with championship belts in three weight classes and certainly enhances her resume for potential hall of fame status down the road.