Promoter Ben Shalom of BOXXER believes the winner of the upcoming grudge match between Claressa Shields and Savannah Marshall will be the biggest star in women's boxing.

Shields and Marshall will stake their undefeated records in a high-stakes unification, for the undisputed middleweight crown, on October 15 at the O2 Arena, live on ESPN+ and Sky Sports.

"Whoever wins this fight is, I think, going to be the biggest name in the female sport," BOXXER's Ben Shalom told Sky Sports. "It's going to have that many eyeballs on it, it's that important.

"Savannah knows that but she's not looking past this fight. She's not looking past October 15. She knows that this is what she's been training for and, at the end of the day, it's just a fight. She will get in there as ready as ever and beyond that she knows what's on offer."

The bout was scheduled to take place earlier this month. It was pushed back, one day before the fight was going to take place, due to the unexpected death of Queen Elizabeth II - which prompted most organizations to suspended UK sporting events that weekend for a period of mourning.

"It was a difficult moment for all involved. We knew it was going to have wide-ranging effects and ultimately it was taken out of our hands on the Friday morning when football was cancelled and everything like that. We knew that the Board was going to have to make a very, very difficult decision either way," Shalom explained.

Marshall handed Shields her only defeat in a boxing ring, back in 2012, when the two fighters were amateurs. Shields would move forward to cap her highly successful amateur run with a gold medal in two Olympic games. As a pro, Shields captured world titles in three weight classes - with two undisputed reigns.