Kasumi vs Mai Shiranui
Or better known as the Battle of the Busts.
Mai is the original bouncy ninja, while Kasumi is the upstart. Shiranui Ninjitsu versus Mugen Tenshin Hajin Mon. Both girls have ninpo techniques of equal strength, so it has to be physical combat.
Mai has the experience on her side, but Kasumi is no pushover. Should you get past the bounciness, who would win?