Sutherland hits first Women's ton at the MCG
Ffion Wynne
BBC Sport Journalist in Melbourne
Women's Ashes: One-off Test, Melbourne (day two of four)
England 170 (71.4 overs): Sciver-Brunt 51; King 4-45
Australia 422-5 (120 overs): Sutherland 163; Bell 2-94
Australia lead by 252 runs
Annabel Sutherland's sparkling century and seven dropped catches from England gave Australia complete control of the one-off Ashes Test match in Melbourne.
The hosts, eyeing a 16-0 clean sweep for the series, finished day two on 422-5 and with a commanding lead of 252.
Sutherland was dropped on 29 and 31 before grinding England down to reach 163 from 258 balls, her third Test century in just six matches.
Beth Mooney also ruthlessly punished England's mistakes, as she was dropped three times on eight, 11 and 18 before finishing the day unbeaten on 98.
All-rounder Sutherland added 80 for the second wicket with Phoebe Litchfield, who was caught behind for 45 off Lauren Bell after a fine opening spell, then added a further 71 with captain Alyssa Healy and 154 with Mooney as England's bowlers toiled admirably but were horribly let down in the field.
Ecclestone removed Ash Gardner for 44 late in the day after she had also been put down on 12 and 36, but Australia have a wilting England side at their mercy with two days to play. They even had the luxury of resting an injured Ellyse Perry as a precaution.
England's selection was also brought into question as Ecclestone has bowled 39 overs in the innings so far, with Ryana Macdonald-Gay's medium pace preferred to Charlie Dean's off-spin.
The day also saw a new world record attendance for a women's Test with a crowd figure of 23,561 in just two days - surpassing the previous record of 23,207 at Trent Bridge in 2023.
England fall apart in the field
'Goodness me!' - England drop seven catches
Considering the dismal nature of the tour so far for England, the fact this was arguably their worst day speaks volumes.
Youngsters Litchfield and Sutherland looked at ease in the morning session before Bell drew an outside edge from the former, gaining reward for a lively and economical spell which tested the batters' patience regularly.
But that was a very rare bright spark in England's day as the painfully familiar sight of spilled catches dominated the day.
Though Macdonald-Gay dropped the first chance to get rid of Mooney - a straightforward catch at cover with the batter on eight - she responded admirably with the ball to produce three more chances.
But they were all spilled. Ecclestone and Maia Bouchier dropped the next two at slip and gully respectively, before Ecclestone also dropped Gardner off Macdonald-Gay on 12.
Gardner received another life from Lauren Filer on 36 but a much tougher effort was put down in her follow-through.
Macdonald-Gay was rewarded with Sutherland's wicket but given her inexperience, she lacked the consistency to play a holding role for Heather Knight which led to the increased workload on Ecclestone.
England's fielding has been below-par throughout the series but perhaps more of a concern is the immediate dip in body language and attitude which follows, and leads to the drops becoming seemingly contagious for all.
Sutherland shines as Mooney nears history
Sutherland departs for 163
Sutherland's first Ashes century came batting at number eight at Trent Bridge in 2023, and her second came while batting at three to demonstrate her remarkable skill and versatility.
The 23-year-old has passed 30 three times in Tests and made a hundred on each occasion, this time becoming the first woman to score one at the Melbourne Cricket Ground.
She expertly moved through the gears after Litchfield's departure, scoring at a strike-rate of 54 in the first session, 67.4 in the second and at 112 during her brief stint in the third.
With 21 fours and a six in her knock, England had no answers after the costly dropped chances as Sutherland was intent on making them pay.
She found excellent company in the proactive Mooney, whose fifty came from just 64 balls, and needs just two more runs on day three to become the first Australian woman to score a century in all three formats.
Mooney, who also kept wicket in the first innings, now has 401 runs across the series compared to England's top-scorer Nat Sciver-Brunt with 209.
Australia's lead already looks formidable but they have the opportunity and the time to ensure England's tour on a completely humiliating note.