Nathaniel Knight-Percival pounced three minutes from time to hand Wrexham victory at Darlington.
The visitors had defended stoutly at times but also had to ride their luck.
Chris Senior was the Quakers' biggest threat and shot just wide with a spectacular bicycle kick, before having a close-range effort blocked.
Andy Mangan launched a swift Wrexham counter, finding Curtis Obeng on the right who crossed for Knight-Percival to head home a late winner.
Darlington: Russell, Miller (Clarke 46), Austin, Hone, Brown, Terry, Gary Smith (Chandler 63), McReady, Powell, Senior, Hatch (Michael Smith 79). Subs Not Used: Lowson, Main.
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