Rain ruined the play on the outside courts on day one of the Australian Open ©Getty Images

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Australia's world number one Ashleigh Barty came from behind to go through ©Getty Images
Australia's world number one Ashleigh Barty came from behind to go through ©Getty Images
Novak Djokovic went through in four sets ©Getty Images
Novak Djokovic went through in four sets ©Getty Images
Japan's defending champion Naomi Osaka breezed through ©Getty Images
Japan's defending champion Naomi Osaka breezed through ©Getty Images
Swiss icon Roger Federer was a comfortable winner ©Getty Images
Swiss icon Roger Federer was a comfortable winner ©Getty Images
Serena Williams dropped just three games as she began her pursuit of a record-equalling 24th Grand Slam ©Getty Images
Serena Williams dropped just three games as she began her pursuit of a record-equalling 24th Grand Slam ©Getty Images
Supporters of Greece's Stefanos Tsitsipas celebrate his progression ©Getty Images
Supporters of Greece's Stefanos Tsitsipas celebrate his progression ©Getty Images
Fifteen-year-old Coco Gauff earned another victory over Venus Williams ©Getty Images
Fifteen-year-old Coco Gauff earned another victory over Venus Williams ©Getty Images
The wet weather means a packed schedule is planned tomorrow ©Getty Images
The wet weather means a packed schedule is planned tomorrow ©Getty Images