From the depths of despair, Nick Kyrgios is feeling buoyant again and eyeing a shock Australian Open comeback.

In his first interview since announcing a Battle of Sexes showdown with Aryna Sabalenka next month , Kyrgios conceded he was feeling the pressure to beat the women's world number one.

More tellingly, the mercurial former Wimbledon finalist also revealed he had made a "miracle" recovery from a career-threatening knee injury and was hoping to be fit for the Melbourne Park major in January.

"Honestly, this has been the first person I've told, I guess, to the media, but the last month for me has been, I don't know what's changed with my knee," Kyrgios told AAP.

"Like around that Washington period [in late July], I really didn't have hope to be able to play AO [Australian Open] o

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