Caroline Wozniacki started the defence of her Australian Open title with a 6-3 6-4 victory against Belgian Alison van Uytvanck.
The Dane, who has rheumatoid arthritis, broke her rival once in each set and won in one hour and 33 minutes.
World number two Angelique Kerber also moved into the second round with a 6-2 6-2 win over Slovenia’s Polona Hercog.
