Mayer’s Relentless Pressure Took Three Belts From Montreal
Mikaela Mayer defeated Mary Spencer by unanimous decision on October 30, 2025, at Montreal Casino in Canada. Scores of 100–90 and 98–92 twice gave Mayer the WBA, WBC and WBO super welterweight championships and made her a three-division world champion.
The move to 154 pounds offered a new championship challenge
Mayer entered as the reigning WBO welterweight champion after earlier winning titles at super featherweight. Spencer held the WBA super welterweight belt, while the vacant WBC and WBO championships were also available.
The Canadian champion had the apparent size advantage and home-country setting. Mayer nevertheless approached the contest aggressively, looking to impose her own pace rather than allow Spencer to control distance.
The jab and right hand established a sustained advantage
Mayer pressed behind her jab and crouched into position for straight right hands. Left hooks followed as she varied the attack and kept Spencer defending.
Body work and combinations helped maintain that pressure. Spencer searched for room to reset, but Mayer repeatedly closed the distance and continued finding openings as the ten-round contest progressed.
A clear verdict confirmed another divisional breakthrough
All three judges favored Mayer by wide margins. She improved to twenty-two wins and two defeats, while Spencer suffered the third loss of her professional career.
The result consolidated three championships at super welterweight without making Mayer undisputed, because the IBF belt remained separate. Her Montreal performance added another championship division through sustained accuracy and activity, completing a successful move up while the scheduled distance gave Spencer no late route back into the fight.
Sources
- Top Rank: official result and tactical report
- Fightmag: title stakes and date
- World Boxing News: combinations and separate IBF title
