Two-weight queen Mikaela Mayer looks to conquer a third weight class on enemy soil.

Mayer will challenge Canadian fan favorite Mary Spencer for the WBA super welterweight world title this Thursday, Oct. 30, at Montreal Casino in Montreal, Canada. The vacant WBC and WBO belts will also be up for grabs in this newly minted three-title showdown.

Mayer (21-2, 5 KOs) is the current WBO champ at welterweight, defeating Sandy Ryan via majority decision in September 2024 before securing a more decisive triumph in March's rematch. Spencer (10-2, 6 KOs), a 2012 Olympian, defended her title in April with a unanimous decision over former world champion Ogleidis Suarez.