The win helped the defending champions top Group 1 with six points, with a semi-final berth looking all but certain.

Chasing 113, Alyssa Healy and Beth Mooney were sensational, scoring half centuries, as they won the match with 4.1 overs to spare.

Healy was unbeaten on 54 while her compatriot Mooney finished 56 not out.

This was the eighth half-century for Healy, meaning she has overtaken Stafanie Taylor of the West Indies and Suzie Bates of New Zealand for the number of 50s at the Women's T20 World Cup.

Meg Lanning opted to bowl after winning the toss and Sri Lanka made a decent start.

Openers Harshitha Samarawickrama and skipper Chamari Athapaththu combined for 50 runs before Grace Harris pulled off a great catch to dismiss Athapaththu.

After showing her prowess, Harris stumped Samarawickrama before dismissing Oshadi Ranasinghe for a duck.

Anushka Sanjeewani went down to Georgia Wareham with Sri Lanka’s middle order collapsing.

Megan Schutt got Vishmi Gunaratne for 24 and followed up with getting the wickets of Ama Kanchana, Malsha Shehani and Sugandika Kumari in the final over as Sri Lanka reached 112/8 in 20 overs.

Having won the last two T20 World Cups, the Aussies are in fine form and well on course for a third consecutive title.