Top-ranked Aryna Sabalenka is favourite to win a third Australian Open in four years but faces strong competition from a United States contingent led by Coco Gauff and defending champion Madison Keys.

World number two Iga Swiatek is another big threat while two-time Melbourne champion Naomi Osaka will hope to be in the mix when the first Grand Slam of the year begins on Sunday.

Originally published on doc.afp.com, part of the BLOX Digital Content Exchange.