The world champions, who lost to Bangladesh a week ago in one of the greatest upsets in cricket history, made a nonsense of that aberration as they dismissed their opponents for 139, then raced home with 31 overs to spare.
Bangladesh collapsed from 113 for two in the 24th over at Old Trafford to be dismissed in 35.2 overs after being put in.
Symonds, bowling off-spin and finding significant turn, took career-best One-Dy Iternational figures of five for 18 from 7.2 overs. Wrist spinner Brad Hogg [ Images ] took three for 29.
Mohammad Ashraful [ Images ], who made 58, and Shahriar Nafees, who made 47 -- the only two batsmen to get past five -- had resurrected the innings with a 90-run stand after Brett Lee [ Images ] had taken two early wickets.
The last eight wickets, however, fell for 26 runs in just under 12 overs.
The 20-year-old Ashraful became only the second Bangladeshi to score a century in his last game against Australia, before making a lightning 94 against England [ Images ].
He looked set for a repetition, hitting 20 off the 11th over from Lee, including two sixes off the top edge.
Hogg and Symonds then strangled the scoring rate after the Bangladeshis looked well placed on 97 for two after 20 overs.
Symonds, who began the tournament with a two-game ban for staying out all night before Australia's opening game but who then scored 73 against England at Chester-le-Street, yorked Nafees as he shaped to sweep to make it 113 for three.
Next ball he had captain Habibul Bashar caught behind off a straight ball for a golden duck.
He then bowled Aftab Ahmed as the batsman played across the line to leg and removed Ashraful by diving to his right and taking a one-hand catch off his own bowling. He wrapped up the innings by bowling Mohammad Rafique for a duck.
Ashraful's last three scores have been 100, 96 and 58. He had passed 50 only three times in 49 previous one-dayers.
J. Omar lbw Lee 3
S. Nafees b Symonds 47
T. Imran c Gilchrist b Lee 4
M. Ashraful c&b Symonds 58
H. Bashar c Gilchrist b Symonds 0
A. Ahmed b Symonds 5
K. Mashud b Hogg 4
M. Islam Rana st Gilchrist b Hogg 2
M. Rafique b Symonds 0
M. Mortaza c Martyn b Hogg 0
N. Hossain not out 0
Extras: (lb-6, nb-4, w-6) 16
Total: (all out, 35.2 overs) 139
Fall of wickets: 1-13, 2-23, 3-113, 4-113, 5-124, 6-137, 7-139, 8-139, 9-139, 10-139
Bowling: Lee 6-1-36-2 (nb-4, w-3), McGrath 6-1-19-0, Gillespie 3-0-17-0, Watson 4-0-14-0 (w-1), Hogg 9-1-29-3 (w-1), Symonds 7.2-1-18-5 (w-1).
A. Gilchrist not out 66
M. Hayden not out 66
Extras: (nb-1, w-7) 8
Total: (for no loss, 19 overs) 140
Did not bat: R. Ponting, D. Martyn, A. Symonds, M. Hussey, S. Watson, B. Hogg, J. Gillespie, B. Lee, G. McGrath.
Bowling: Mortaza 6-0-32-0, N. Hossain 3-0-29-0 (nb-1 w-1), Rafique 6-0-53-0, Islam Rana 4-0-26-0 (w-2).
Result: Australia won by 10 wickets