Claressa Shields vs Savannah Marshall has been postponed to 15 October following the news of Queen Elizabeth's death
The fight will take place in the 02 Arena in London.
Both fighters have history as Marshal beat Shields at the 2012 AIBA Women's World Boxing Championships.
Claressa Shields calls herself the 'G.W.O.A.T.', Greatest Woman of All Time.
Whereas, Savannah Marshal has been nicknamed the 'Silent Assassin'.
They both will be fighting for the undisputed middleweight titles.
They both were expected to step in the ring on 10 September but now it has been postponed.