England chose to bowl against Australia
England will be chasing again as they aim to keep alive their hopes of a drawn Ashes series after Heather Knight won the toss in Canberra.
There is the threat of overnight rain, which could bring DLS into the equation, and in those circumstances chasing is often preferable.
Australia have retained the Ashes with an 8-0 lead with a win at the SCG and can win them here.
Both teams remain unchanged and England show faith in their XI. Australia captain Alyssa Healy has been ruled out for the remainder of the T20I series and will be further assessed ahead of the day-night Test in Melbourne. Ash Gardner also misses out again with her calf injury and will be monitored ahead of the final T20I in Adelaide.
All-rounder Heather Graham has joined the team for the last two T20Is.
Australia 1 Georgia Voll, 2 Beth Mooney (week), 3 Phoebe Litchfield, 4 Ellyse Perry, 5 Annabel Sutherland, 6 Tahlia McGrath (captain), 7 Grace Harris, 8 Georgia Wareham, 9 Alana King, 10 Kim Garth, 11 Megan Schutt
England 1 Maia Bouchier, 2 Danni Wyatt-Hodge, 3 Sophia Dunkley, 4 Nat Sciver-Brunt, 5 Heather Knight (captain), 6 Amy Jones (week), 7 Freya Kemp, 8 Charlie Dean, 9 Sophie Ecclestone, 10 Sarah Glenn, 11 Lauren Bell