Three world titles are on the line Thursday when Canada's Mary Spencer meets American Mikaela Mayer in Montreal.

The 40-year-old Spencer defends her WBA super-welterweight crown with the vacant WBC and WBO 154-pound titles also up for grabs in the wake of the recent retirement of Norway's Cecilia (The First Lady) Braekhus. The 35-year-old Mayer, a former super-featherweight (130-pound) titleholder who holds the WBO welterweight (147-pound) belt, is moving up in weight in a bid to become a three-division champion.

American Oshae Jones holds the IBF title at 154 pounds.

While there is plenty of hardware on the line Thursday, Spencer was more interested in the challenge.

"I never really cared about (championship) belts, to be completely honest," she said. "I am excited to be in exciting f

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