England 346 (Root 83, Malan 62, Cummins 4-80) and 4 for 93 (Root 42*) trial Australia 7 for 649 dec (Khawaja 171, S Marsh 156, M March 101) by 210 runs
Sydney: England are facing another defeat in the final Ashes Test after Australia once again dominated on the fourth day in Sydney.
The tourists closed day four on 4-93, still 210 short of making the home side bat again.
They had been reduced to 2-15 and 3-43, only to be held together by captain Joe Root's unbeaten 42.
On a day of extreme heat in Sydney, Australia added to their overnight 4-479, eventually declaring on 7-649.
Shaun Marsh and brother Mitchell both completed their second centuries of the series as Australia rattled along at almost five runs per over.
Usman Khawaja (171), Shaun Marsh (156) and Mitchell Marsh (101) scored centuries for Australia with off-spinner Moeen Ali taking two wickets for 170.
England's bowlers toiled away for a total of 193 overs for more than 13.5 hours in searing temperatures.
Mason Crane, the 20-year-old leg-spinner, was unfortunate to return 1-193, the most expensive figures by an England bowler on Test debut.
Australia, already 3-0 up and with the Ashes secured, are on course to earn their ninth win in 10 home Tests against England.
As they pursue the six remaining wickets on the final day, they will have benefit of a pitch showing the occasional sign of uneven bounce and large amounts of turn for off-spinner Nathan Lyon.