Australia slid from 105-1 to 134-4 as England ended day one of the final Ashes Test on top in rainy Sydney.
Tim Bresnan was the most successful bowler, taking 2-47 as England made the most of overhead cloud cover and a pitch offering some seam movement.
Rain took the players off for 90 minutes in the middle of the day and England picked up two late wickets before a second and final stoppage.
Michael Clarke made just four in his first Test as Australia's captain.
His fortunes contrasted with those of debutant Usman Khawaja, the 24-year-old left-hander displaying plenty of confidence before coming unstuck late on and top-edging a sweep off Graeme Swann to depart for 37.
Khawaja was caught by Jonathan Trott at square-leg, and that was the last act of a day which had seen Shane Watson (45) make yet another start without registering a major score, while Phillip Hughes (31) compiled his best score in eight Test innings against England.
Hughes fell to Chris Tremlett, while James Anderson got through 20 overs and was unlucky not to pick up at least one wicket of his own.
In his first Test as captain with Ricky Ponting out injured, Clarke arrived early for the coin toss, and looked a little nervous. He could be granted the role on a permanent basis later this year if Australia pull off a win in Sydney, and thus stop England winning the series.
After undisciplined performances from the top order in previous Tests - and whether or not galvanised to change tactics by Clarke - Watson and Hughes addressed the new ball with caution. Even so, the first hour was a difficult period for the batting side.
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