Stranraer built on last week's win away to Forfar Athletic with an impressive three points away to Airdrieonians.
The Diamonds were disappointed not to take the lead when Liam Watt had a penalty saved superbly by David McGurn.
Stranraer had a strong finish to the half and Ryan Thomson had two headers saved by Neil Parry.
The second period seemed to be winding towards a hard-fought draw, but in the final 10 minutes, Craig Pettigrew flung in a cross for Thomson to nod in.
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