Mikaela Mayer cemented her status among the elite of women’s boxing with a commanding victory over Mary Spencer in hostile territory on Thursday night, capturing three versions of the super welterweight title in front of a partisan Canadian crowd at Montreal Casino.
The American standout swept the scorecards 100-90, 98-92, and 98-92, dominating the local favorite to claim the WBA, WBC, and WBO super welterweight belts and add yet another layer to her championship legacy.
Already the reigning WBO welterweight queen, Mayer (22-2, 5 KOs) becomes a three-weight world champion, extending a career that has seen her climb steadily from super featherweight to new heights at 154 pounds.
Spencer (10-3, 6 KOs), a latecomer to the professional ranks after an accomplished amateur career, simply couldn’t match Mayer’s poise, experience, or relentless rhythm. Despite holding the size advantage, she was second best in almost every department.
From the opening bell, Mayer imposed herself behind a crisp jab and well-timed right hand. She slipped inside the taller Canadian’s reach, working over the body before rising with hooks that repeatedly found their mark.
Spencer circled and searched for space, but Mayer’s control of distance and tempo left little room for error. By the later rounds, Spencer was being pushed back and punished by a fighter who refused to let her catch her breath.
“I knew I had to come up underneath Mary Spencer and come over the top with the big hooks,” Mayer stated afterward. “That’s what we trained for, and you saw me in the last few rounds landing those big right and left hooks to the head.”
It was a statement performance from a fighter once written off after her narrow defeat to Alycia Baumgardner in 2022. Since then, Mayer has quietly rebuilt, showing resilience that separates contenders from champions.
The victory now leaves Mayer with enviable decisions. She can either stay put at 154 pounds to challenge IBF champion Oshae Jones for undisputed status or return to welterweight, where Olympic gold medalist Lauren Price awaits in a potential headline clash.
“I think the most important thing is I have options,” Mayer added. “I came off two years where my career kind of took a left turn. So having options is definitely a blessing. I’d love to defend both belts, maybe go back to 147, become undisputed there, and come back up to defend at 154.”
Wherever she lands next, the win in Montreal reaffirms her place as one of boxing’s most durable and adaptable champions — one capable of reinventing herself across divisions while remaining a marquee name in women’s boxing.
Super Middleweight: Wilkens Mathieu (15-0, 10 KOs) UD 10 Shakeel Phinn (27-4-2, 17 KOs) — Scores: 99-90 & 98-91 (x2). Mathieu wins vacant NABF and WBC Continental Americas titles.
Junior Welterweight: Arthur Biyarslanov (20-0, 16 KOs) UD 10 Sergey Lipinets (18-5-1, 13 KOs) — Scores: 97-92, 99-90 & 96-93. Biyarslanov retains NABF title.
Light Heavyweight: Mehmet Unal (14-0, 12 KOs) TKO 1 Ralfs Vilcans (18-3, 7 KOs) — Time: 2:44. Unal retains the WBC Continental Americas belt.
Welterweight: Christopher Guerrero (16-0, 9 KOs) UD 10 Williams Andres Herrera (17-5, 7 KOs) — Scores: 97-93, 99-91 & 98-92. Guerrero retains WBC Continental Americas title.
Phil Jay is a veteran boxing journalist with over 15 years of experience covering the global fight scene. As Editor-in-Chief of World Boxing News (WBN) since 2010, Jay has interviewed dozens of world champions and reported ringside on boxing’s biggest nights.
