Former unified world champion Mikaela Mayer is standing firm in her belief that she was robbed of a victory last Saturday night at the O2 Arena in Las Vegas.

In a four belt unification, Baumgardner entered the ring with the WBC, IBO titles and added the WBO, IBF belts to her collection.

With several close rounds, Baumgardner won the fight with a ten round split decision - with two scores of 96-95 and a third scoring it 97-93 to Mayer.

"I do believe I won strongly," Mayer said to Sky Sports. "I was very confident, my corner was confident, and you know my corner, my coach, he doesn't mess around and he tells me the truth.

"We stuck to the game plan, I was out-boxing her and I clearly believe I won that decision. It is disappointing. I saw her face at the ends of those rounds and she was defeated, tired, moving, running, she knew she didn't win that fight and you could see it in her face she wasn't confident."

Mayer wants an immediate rematch, but Baumgardner is heading in another direction - as he plans to pursue an undisputed fight with WBA champion Hyun-Mi Choi.

"I really feel like my legacy, what I have always wanted my legacy to be is somebody who challenges the best and puts it all on the line and makes the biggest fights possible and, although I didn't get the decision yesterday, that doesn't change that goal for me," Mayer said.

"I still want the biggest fights and, if Baumgardner doesn't want to give me a rematch which she said yesterday, I think she should because I think I deserve a rematch and I think I won and if she believes that she is the best she will give that to me, but if not, I am still going to go for the biggest fights.

"I still want Katie Taylor, I still feel I deserve that," she added. "She (Baumgardner) knows she lost, I genuinely believe that she knows that she lost but I think it is going to change because where else is she going to get that kind of money and the fans want to see it? This is about the fans at the end of the day, it is about entertainment. I hope she becomes the champion that she should be and gives me another shot and gives the fans that fight."