Mayer’s Montreal Opened a New Championship Division
Mikaela Mayer became a three-division world champion by outpointing Mary Spencer on October 30, 2025, in Montreal. The ten-round contest at Montreal Casino ended by unanimous decision, with Mayer winning 100–90, 98–92 and 98–92 to collect three super welterweight belts.
Spencer defended one championship while two more were vacant
The WBA belt belonged to Spencer entering the contest. The WBC and WBO titles had been added as vacant championships, increasing the significance of the 154-pound matchup.
Mayer had already held world titles at super featherweight and welterweight. Winning in Montreal would extend that championship record to a third division against an opponent fighting in her home country.
Accurate combinations prevented Spencer from setting the terms
Mayer used her jab and movement to establish the pace, then followed with straight punches and hooks. She repeatedly reached the body and head while Spencer tried to make her reach and power count.
Spencer showed resilience but could not consistently disrupt the challenger’s rhythm. Mayer’s pressure became increasingly effective in the later rounds, leaving the defending champion with isolated successes rather than sustained control.
The unanimous scorecards reflected a commanding away victory
Mayer’s hand was raised after the completed distance, and the WBA, WBC and WBO championships all went to the American. Spencer lost the belt she had entered the ring defending.
The victory created several possible routes for Mayer across two neighboring divisions. Those future choices remained separate from the confirmed achievement: a clear ten-round win in Canada that established her as a champion at super welterweight.
Sources
- WBA: combinations, pacing and championship result
- WBC: late pressure and title win
- Fightmag: separate title stakes and scorecards
