Australia (20) 55
Tries: Horwill, Mitchell 2, Giteau, Moore, Alexander, Pocock, O'Connor Cons: Giteau (4), Mortlock (2) Pen: Giteau
Barbarians (7) 7
Try: Balshaw Con: McAlister
Josh Lewsey is powerless to stop Matt Giteau scoring Australia's third try
England World Cup winners Josh Lewsey and Martin Corry bowed out of rugby as the Barbarians were beaten by Australia at the Sydney Football Stadium.
Lewsey played the full 80 minutes while Corry came on as a late replacement in their final games before retirement.
James Horwill, Drew Mitchell and Matt Giteua crossed for first-half tries for the hosts before Iain Balshaw replied.
Further tries from Stephen Moore, Ben Alexander, Mitchell, David Pocock and James O'Conner took the hosts over 50.
Leinster scrum-half Chris Whitaker, one of three Wallabies playing against Australia, also played his last game before moving into a likely coaching career.
The Barbarians, playing their first match in Australia in their 119-year history, beat England at Twickenham last week but could barely get their hands on the ball in the opening period.
Australia, inspired by the running of captain Stirling Mortlock and wing Lachie Turner, raced into a 20-0 lead after 23 minutes.
Lock James Horwill charged onto George Smith's pass for the opening try, Giteau added a penalty before converting the first score by Mitchell, who picked up and beat four defenders before stretching over.
Fly-half Giteau conjured a superb third with a double dummy before steaming through a gaping hole and converting his own try.
Mortlock and Turner were both denied further tries before the Baa-Baas got off the mark with the last move of the half, a length-of-the-field effort finished by Balshaw in the left corner.
Luke McAlister converted to make it 20-7 at the interval, but that was as good as it good for the invitational side, captained by Wallaby flanker Phil Waugh.
After a barrage of replacements there were no further scores until the 57th minute, when Smith pilfered Barbarians ball and hooker Moore goose-stepped his way over.
That was the cue for four more tries in the final 15 minutes as the Wallabies enjoyed a leisurely warm-up for two Tests against Italy and one against France over the next three weeks before the Tri-Nations.
Australia: Adam Ashley-Cooper; Lachie Turner, Stirling Mortlock (capt), Berrick Barnes, Drew Mitchell, Matt Giteau, Luke Burgess, Richard Brown, George Smith, Matt Hodgson, Nathan Sharpe, James Horwill, Al Baxter, Stephen Moore, Benn Robinson.
Replacements: Tatafu Polota-Nau (for Moore), Ben Alexander (for Baxter, 63), Dean Mumm (for Hodgson), David Pocock (for Brown, 63), Josh Valentine (for Burgess, 43), Quade Cooper (for Giteau, 74), James O'Connor (for Ashley-Cooper, 63).
Barbarians: G Murphy (Leicester & Ireland); I Balshaw (Gloucester & England), S Williams (Toulon), S Mapusua (London Irish & Samoa), J Lewsey (London Wasps & England); L McAlister (Sale & New Zealand), C Whitaker (Leinster & Australia); C Dermody (London Irish & New Zealand), S Bruno (Sale & France), BJ Botha (Ulster & South Africa), C Jack (Saracens & New Zealand), P Tito (Cardiff Blues), J Collins (Toulon & New Zealand), P Waugh (Waratahs & Australia, capt), D Lyons (Scarlets & Australia).
Replacements: S Brits (Stormers & South Africa - for Bruno, 60), G Somerville (Gloucester & New Zealand - for Dermody, Dermody for Botha, 70), M Corry (Leicester Tigers & England - for Jack, 66), S Betsen (London Wasps & France - for Waugh, 65), J Marshall (Saracens & New Zealand - for Whitaker, 47), G Jackson (Saracens - 41), B Blair (Cardiff Blues & New Zealand - for Murphy, 47).
Referee: Stuart Dickinson (Aus)