Wimbledon champion Elena Rybakina reached the last four in Melbourne after defeating Jelena Ostapenko ©Getty Images

Picture Gallery

Stefanos Tsitsipas of Greece celebrates after reaching the semi-finals of the Australian Open ©Getty Images
Stefanos Tsitsipas of Greece celebrates after reaching the semi-finals of the Australian Open ©Getty Images
Victoria Azarenka hits a shot during her quarter-final triumph over Jessica Pegula ©Getty Images
Victoria Azarenka hits a shot during her quarter-final triumph over Jessica Pegula ©Getty Images
Sebastian Korda speaks to the trainer before retiring injured midway through the third set of his quarter-final with Karen Khachanov ©Getty Images
Sebastian Korda speaks to the trainer before retiring injured midway through the third set of his quarter-final with Karen Khachanov ©Getty Images
Jessica Pegula waves her racket in frustration during her match with Victoria Azarenka ©Getty Images
Jessica Pegula waves her racket in frustration during her match with Victoria Azarenka ©Getty Images
Karen Khachanov, playing as a neutral, reached the semi-finals at Melbourne Park after Sebastian Korda retired hurt ©Getty Images
Karen Khachanov, playing as a neutral, reached the semi-finals at Melbourne Park after Sebastian Korda retired hurt ©Getty Images
Jiří Lehečka of the Czech Republic reached a Grand Slam quarter-final for the first time in Australia but was defeated by Stefanos Tsitsipas ©Getty Images
Jiří Lehečka of the Czech Republic reached a Grand Slam quarter-final for the first time in Australia but was defeated by Stefanos Tsitsipas ©Getty Images
Desirae Krawcyk and Neal Skupski were among the winners as the doubles competitions continued in Melbourne, reaching the last four of the mixed event ©Getty Images
Desirae Krawcyk and Neal Skupski were among the winners as the doubles competitions continued in Melbourne, reaching the last four of the mixed event ©Getty Images
Britain's Andy Lapthorne was among the winners as wheelchair action got underway in Melbourne ©Getty Images
Britain's Andy Lapthorne was among the winners as wheelchair action got underway in Melbourne ©Getty Images
Rod Laver, left, who has the main court at the Australian Open named in his honour, was among the spectators for the singles quarter-finals ©Getty Images
Rod Laver, left, who has the main court at the Australian Open named in his honour, was among the spectators for the singles quarter-finals ©Getty Images