Sabalenka favourite at Australian Open but faces Swiatek, US threats

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. 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 kick on from there, not winning another tournament all year, and the world number nine will have a target on her back as the title holder. Three other Americans are ranked inside the world's top 10...