Naomi Osaka is out of the Australian Open.
The two-time champion was forced to retire due to injury during her third round clash with Belinda Bencic.
Earlier, top seed Aryna Sabalenka advanced following her 7-6, 6-4 win over Clara Tauson.
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In the men's singles, second seed Alexander Zverev is through to the fourth round after a straight sets win over Jacob Fearnley.
