Chasing a challenging 244-run target, Mohammad Ashraful's 35 off 36 balls including five fours and a six was the only signs of resistance for the Tigers who skittled out for 169 in 41.2 overs.

Ireland's first victory in the second stage was shaped by their military medium pace bowling, which not only stopped the flow of runs but also produced wickets at regular intervals. Boyd Rankin, Dave Langford Smith, Trent Johnston and Kyle McCallan each chipped in with two wickets to ensure their overall second win after ousting Pakistan in the group stage.

But the credit must go to opener William Porterfield's sedate but effective 85 off 136 balls that inspired Ireland to post 243-7 in 50 overs after captain Johnston's brave decision to bat first on a bouncy Barbados pitch.

After eliminating India from the tournament and defeating World No. 1 South Africa, the defeat came as a shock for Bangladesh, who suffered early blows to slump to 48-3. Tamim, who scored an unusually slow 29 off 59 balls, was the fourth man out after adding 45 runs with Ashraful. He played on Johnston while trying to make room and hit on the off-side.

Hero of Bangladesh's 67-run victory against South Africa, Ashraful then hooked Rankin to Langford-Smith in the last ball of the 22nd over with the total on 102 as the Irish were in full control and captain Habibul Bashar's unconvincing efforts (32 off 57 balls) were not enough to see Bangladesh through.

Earlier, Shahriar Nafees's lean patch continued as the left-handed opener gloved a catch to wicketkeeper Niall O'Brien on seven when he mistimed a hook against Rankin.

Aftab Ahmed (12) smashed Rankin for a four and a six in the ninth over but got a thin edge to Andre Botha's first ball with wicketkeeper Niall O'Brien holding a superb catch on a widish delivery. Botha then ran out Shakib Al Hasan when the bowler deflected Tamim's straight drive onto the stumps at the non-striking end.

In the morning, Bangladesh bowlers failed to take any wicket for the first 33 overs as Porterfield, who hit only three boundaries, put on 92 runs for the opening wicket with Jeremy Bray (31 off 70 balls).

Mortaza bowled an accurate opening spell but his new ball partner Shahadat Hossain found it harder to hit the right line on his Cup debut after replacing Syed Rasel, the inform left-arm seamer who sprained his ankle while trying to hold a high catch during practice just before the toss.

The Tigers finally hit the inroads when they ran out Bray and Eoin Morgan (5).

The famous left-arm spin trio of Bangladesh got little purchase against the Irish who had five left-handers in the top-order. Shakib finally bowled a wicket-taking delivery in the 34th over when he had Niall O'Brien caught by Tamim at fine leg after the southpaw had tried to reverse sweep.

Porterfield, dropped by Abdur Razzak off a no-ball and floored by Mohammad rafique off his own bowling, was dismissed in the 42nd over when he tried to paddle-scoop paceman Mashrafe Bin Mortaza but top-edged to Rafique at short fine leg.

Kevin O'Brien, who cracked a better than run-a-ball 48 with two sixes and as many fours, helped Ireland rattle 77 runs in the last ten overs, with 57 coming in the final five.