Australia opener Chris Rogers praised England's bowling attack after his side's worst day of the Ashes series so far.
England recovered from another disappointing first-innings total of 255 to leave the hosts reeling on 164-9 in reply at the close of day two of the fourth Test at the MCG.
Rogers top-scored with 61 and Brad Haddin reached stumps unbeaten on 43 but otherwise the new holders of the Ashes were blown away by the England pace attack.
"A very disappointing day. England bowled well and we were probably a bit careless at times," Rogers told Sky Sports at the end of the day.
"It's the worst day we've had in the series so far, but it happens and England are still a very good side.
"I think it's one of those surfaces that if you bowl in good areas it is hard to score, and to give England credit they bowled very well today."
England's batsmen have come under fire for their methods of dismissal throughout the series but this time it was the home side who fell victim to a string of loose shots.
"When you get bogged down you're probably looking for releases and I think a few of us did. Whatever happened, it didn't go our way," Rogers said.
He added of the pitch: "It is a little bit two-paced. Some balls seem to go through a bit quicker and others don't so you just have to get yourself in and get a feel for the pace of the wicket. Then hopefully you can score."
Rogers emerged as Australia's top performer despite being hit square in the helmet with a bouncer from Stuart Broad, which drew blood from his face.
"I ducked the wrong one there," the left-hander joked. "It didn't hurt at all for some reason, it probably got me in the right place. It was a bit of a cut from the grill really - I'm fine."
Watch highlights of today's play from 4pm, then join us for The Ashes Verdict from 9pm, The Ashes Extra at 10.30pm and coverage of day three from 11pm - all on Sky Sports 2.