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US Open champion Naomi Osaka is through to the third round at Melbourne Park after beating Tamara Zidansek 6-2, 6-4.

The fourth-seeded Osaka recovered a service break in the second set and, at 4-4, she broke Zidansek's service to love. Osaka hit an ace to save a break point in the last game and clinched it on her second match point with a service winner.

Osaka began the year with a semifinal appearance at the Brisbane International, losing to eventual finalist Lesia Tsurenko

She has reached the semifinals at four of her past five tournaments.

Naomi Osaka into third round of Australian Open after straight-set win

Naomi Osaka into third round of Australian Open after straight-set win

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