Mikaela Mayer insists she "cannot be beat" in this month's world title fight against Mary Spencer which she hopes to follow with a showdown with Lauren Price next year.

American Mayer has stepped up a division to challenge Canada's WBA super-welterweight champion Spencer in Montreal on October 30.

Mayer remains eager to finally share the ring with Britain's unified world champion Price, although she will firstly attempt to become a three-weight world champion by defeating Spencer.

"I'm older than I've ever been but training harder than I've ever trained," 35-year-old Mayer told Sky Sports.

"I just feel like I cannot be beat right now. There's just no way. There's just no way that Mary Spencer is doing the type of work I'm doing and consistently.

"I mean she's announced going into cam

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