Haddin and Smith steady things for the hosts.
Watch official Australia v England Ashes highlights, 5th Test, day one afternoon session.
Brad Haddin came to Australia’s rescue yet again, featuring in an unbroken century stand with Steve Smith to take the home side to 201 for five at tea on the first day of the fifth Ashes Test.
Australia, put in by England, were reduced to a parlous 97-5 shortly after lunch in Sydney but Haddin, who has been a constant thorn in the side of the tourists, was unbeaten on 59 off 79 balls at the break, with Smith on 48.
Wicketkeeper Haddin reached his half-century off 70 balls with a quick single off Ben Stokes shortly before the interval, after coming to the crease following the dismissal of George Bailey for another low score.
Haddin, who has played a crucial role in rescuing Australia on a number of occasions in the one-sided Ashes, now has five 50s and a century in the series.
Bailey, likely playing for his Test place, was dismissed for just one, nibbling at paceman Stuart Broad and edging a catch to Alastair Cook at first slip, who clung on at the second attempt.
England claimed four wickets before lunch after skipper Cook won the toss for the first time in the series.
Stokes dismissed opener Chris Rogers (11) and skipper Michael Clarke (10) and in the final over of the morning James Anderson trapped Shane Watson leg before wicket for 43.
Rogers, who scored 116 in Australia’s eight-wicket victory in the fourth Test, attempted to pull only to drag the ball on to his leg stump.
And Stokes claimed the big breakthrough when he coaxed an edge off Clarke to Ian Bell in the slips.
Australia lost the wicket of David Warner in the first hour, bowled by Stuart Broad for 16.
England had a setback when Test debutant Boyd Rankin pulled up with a hamstring injury bowling in his ninth over and left the ground for treatment.
Rankin was among three English changes from Melbourne, with Test debuts also for middle-order batsman Gary Ballance and leg-spinner Scott Borthwick.
Australia, who are chasing a 5-0 sweep for only the third time in Ashes history, remained unchanged for the fifth consecutive Test after all-rounder Watson (groin) and paceman Ryan Harris (knee) were cleared to play.
England sprung a surprise by dropping Joe Root and elevating Ian Bell to number three, while Michael Carberry kept his place at the top of the order, despite concerns over his slow rate of scoring.
Young leg-spinner Borthwick came in for Monty Panesar, while speedster Rankin got his chance at the expense of Tim Bresnan.
Scoreboard at tea on the first day of the fifth and final Ashes Test between Australia and England at the Sydney Cricket Ground:
Australia 1st innings:
Chris Rogers b Stokes 11
David Warner b Broad 16
Shane Watson lbw b Anderson 43
Michael Clarke c Bell b Stokes 10
Steve Smith not out 48
George Bailey c Cook b Broad 1
Brad Haddin not out 59
Extras (b6, lb1, nb6) 13
Total (5 wickets; 52 overs) 201
Fall of wickets: 1-22 (Warner), 2-51 (Rogers), 3-78 (Clarke), 4-94 (Watson), 5-97 (Bailey)
Bowling: Anderson 15-3-35-1, Broad 13.5-5-42-2, Stokes 12-1-62-2 (5nb), Rankin 8.1-0-34-0 (1nb), Borthwick 3-0-21-0
To bat: Mitchell Johnson, Peter Siddle, Ryan Harris, Nathan Lyon.
Toss: England
Umpires: Aleem Dar (PAK), Marias Erasmus (RSA)
TV umpire: Tony Hill (NZL)
Match referee: Ranjan Madugalle (SRI)
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