MELBOURNE: The irresistible force of Aryna Sabalenka meets the unbreakable spirit of Madison Keys on Saturday in an Australian Open women’s singles final that promises to be a thunderous slugfest. Defending champion Sabalenka was hailed by beaten semifinalist Paula Badosa as being so good it was “like she’s playing a PlayStation” after dishing out a merciless straight-sets bludgeoning to her good friend.