Naomi Osaka won the deciding set against Antonia Ruzic in their opening round match at the Australian Open.
Osaka 6-3 3-6 6-4.
Overnight, the defending women's champion Madison Keys beat Oleksandra Oliynykova in straight sets.
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In the men's draw, Jannik Sinner began his title defence with a walkover win over Raphael Collignon, who was forced to retire in the fourth set due to injury.
Shintaro Mochizuki currently trails Stefanos Tsitsipas 2 sets to 1.
