Samantha Stosur, the 2011 US Open champion, had a rare win on Australian soil when she rallied to beat Dominika Cibulkova 3-6, 6-3, 6-4. It was a confidence-boosting result for the local hope ahead of the Australian Open, which starts next week.
In other first-round matches, seventh-seeded Kiki Bertens beat Bernada Pera 7-5, 6-4, Timea Bacsinszky ousted ninth-seeded Anastasija Sevastova 6-7 (3), 6-4, 6-4, Yulia Putintseva beat Daria Gavrilova 6-1, 7-6 (4), and Camila Giorgi defeated Ajla Tomljanovic 6-3, 6-3.
"It wasn't easy all day, a lot of waiting around, especially coming in so early and the weather not permitting us to go out and play," de Minaur said. "I'm happy with how I dealt with the situation and really happy with the win."