Mikaela Mayer became unified super-welterweight champion with a dominant unanimous-decision victory over WBA champion Mary Spencer in Montreal to claim the vacant WBC and WBO belts.

Former two-division champion Mayer (22-2) applied relentless pressure from the opening bell to overwhelm Spencer (10-3), who struggled to counter despite her size advantage as one judge scored it 100-90 and the other two had it 98-92 for Mayer.

With the IBF title held by Oshae Jones, Mayer could now pursue undisputed status at 154 pounds or return to welterweight to challenge three-belt champion Lauren Price.

"I think the most important thing is that I have options," Mayer said.

"I cleared my head after a tough two years. I'd love to do both - go down to 147 to become undisputed and defend at 154. I think I

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