England were pushed towards the precipice of the fastest Ashes series defeat in more than 100 years as a Travis Head century maintained Australia's grip on the third Test in Adelaide.
Head was dropped on 99 by Harry Brook and spent eight balls one run short of a century before belting Joe Root down the ground for four to draw a deafening roar from his home-town crowd at the Adelaide Oval.
The left-hander moved Australia's second innings past 200 and their overall lead towards 300.
If England's third loss in as many Tests is completed on Saturday, it would mean the Ashes have been decided in 10 days of cricket.
Not since 1921, when Australia needed only eight days of play to win in England, has the destination of the urn been settled so swiftly.
Head's inevitable ton snuffed out brief England hope that was raised when captain Ben Stokes and Jofra Archer added 73 runs in the morning session.
Stokes made 83 and Archer 51 in a stand of 106, the highest by an England ninth-wicket pair in Australia since 1924.
By creeping to 286 all out, 85 behind on first innings, England could have left themselves an outside chance by dismissing Australia for a total below 240 in their second innings.
At 53-2 and 149-4, England clung on before being cut adrift by Head. At some point, England will be tasked with pulling off the highest successful chase on this ground in order to keep the Ashes alive.
Of further concern to the visitors is the fitness of all-rounder Stokes, who is yet to bowl in Australia's second innings.