Unified women's super featherweight champion Mikaela Mayer is backing fellow American Claressa Shields to overcome Savannah if a fight between the pair gets made for later this year.
Following her third round knockout win against Femke Hermans last weekend, a fight for the undisputed women's middleweight title is expected to be announced in the coming days.
When asked about how this contest would play out, Mayer thinks Shields will be too much for Marshall on the night.
"I'm going to sound biased, because Claressa is my team-mate and friend, but although Savannah is proven to have power, I think that Claressa's punch count and speed is a lot for anyone at that weight to handle," Mayer told Sky Sports.
"I do see her coming out on top, but either way I'll be there to support. I can't wait for it.
"Just her ferociousness, when she gets in the ring. She doesn't like to lose and so she has a chip on her shoulder because Savannah is the only one to ever beat her.
"I think we're going to see a different Claressa Shields that night, a scarier one!"