Naomi Osaka has won 19 of her 21 first-round matches at a Grand Slam.
The venue is Melbourne Park.
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Japan's Naomi Osaka opened her defence of the Australian Open title with a dominant win over Colombia's Camila Osorio.
Osorio fought back in the first set, as Osaka raced into a five-set lead.
Osaka quickly regained control and won 6-3.
After taking a four-month break at the end of last season to protect her mental health, the 24-year-old returns to Grand Slam action as the 13th seed.
"I thought I played well, given the circumstances," said Osaka, who has won 23 of her past 24 matches in Melbourne.
I'm happy to be here and see everyone.
I like the hot weather, but when I come here, everyone is welcoming. That has a positive effect on me.
The four-time Grand Slam champion will play an American in the second round.
Dayana was trailing 6-1 0-6 5 when she retired.
Gauff lost on opening day.
When 15 years old, Coco Gauff beat Venus Williams and Naomi Osaka to reach the Australian Open fourth round.
Coco Gauff, the 18th seed, was eliminated on the first day as he lost to China's Qiang Wang.
The world number 112, who is trained by a Wimbledon champion, was leading in the second set when he won it.
The ninth seed from Tunisia withdrew from the tournament before her first-round match because of a back injury.
She said that the pain is still present and that playing in such conditions could ruin her season.
Two-time champion Victoria Azarenka breezed into the second round with a 6-3 6-1 win over Hungary's Panna Udvardy.
There were also wins for the 22nd and 15th seeds, as well as Greece's Maria Sakkari, who beat Germany's Tatjana Maria.
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