Australian Open: Naomi Osaka starts title defence with dominant win

Naomi Osaka has now won 19 of her 21 first-round matches at a Grand Slam

Japan's Naomi Osaka opened her defence of the Australian Open title with a dominant win over Colombia's Camila Osorio on day one in Melbourne.

However, Osaka quickly reasserted her control and wrapped up a 6-3 6-3 win.

After taking a four-month break at the end of last season to protect her mental health, Osaka returns to Grand Slam action as the 13th seed.

"I thought I played pretty well given the circumstances," said Osaka, who has won 23 of her past 24 matches in Melbourne.

"Overall I'm happy to be here and see everyone in the audience.

"I like the hot conditions but when I come here everyone is warm and welcoming. I'm sure that has a positive effect on me."

The four-time Grand Slam champion will play Ukraine's Dayana Yastremska or American Madison Brengle in round two on Wednesday.

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