Claressa Shields says Savannah Marshall is 'underestimating' her and rivalry could set up rematch or trilogy

Claressa Shields says she "accepts but doesn't respect" the number of knockouts Savannah Marshall has in her career ahead of their historic showdown at the O2 Arena on September 10, live on Sky Sports.

Marshall has stopped 10 of her 12 professional opponents, Shields has halted two of her 12 pro fights inside the distance.