Top-ranked Aryna Sabalenka is the favorite 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. READ: Aryna Sabalenka fires Australian Open warning with Brisbane domination Keys stunned title-holder Sabalenka 12 months ago in a classic three-set final to win her first major title aged 29. But she failed to […]... Keep on reading: Aryna Sabalenka favorite at Australian Open, but faces threats