Day two in Melbourne saw top seed Halep come through against Destanee Aiava, despite rolling her ankle, while Bouchard got the better of Oceane Dodin.

Familiar injury problems reared their head in worrying fashion for Halep, who rolled her left ankle during the second set against Aiava.

The Romanian, who has been dumped out in round one at this grand slam in each of the past two years, survived a scare in recovering from 5-2 down to the world number 193 in the opening set to prevail 7-6 (7-5) 6-1.

Bouchard set up a second-round meeting with Halep by seeing off Dodin 6-3 7-6 (7-5) and the top seed does not believe her ankle scare will prevent her facing the Canadian.

"I'm not thinking about that," she said. "I'm used to the ankle...so I don't believe that I will stop. But, you know, first the priority is always the health. So, I will see. In my opinion, I will be able to play."

Meanwhile, third seed Garbine Muguruza made short work of Jessika Ponchet while the likes of Johanna Konta, Karolina Pliskova and Maria Sharapova also progressed.

There was an early exit for an emotional Petra Kvitova, however, the two-time Wimbledon champion bowing out following an epic deciding set with Andrea Petkovic.