Enoch Showunmi headed Leeds into the second round of the Carling Cup with a 1-0 win over League Two Darlington.
Striker Showunmi pounced ater 54 minutes, reacting quicker than goalkeeper David Knight to reach a cross from Robert Snodgrass.
Leeds also hit the bar through Bradley Johnson, but Darlington's young striker David Dowson saw an effort ruled out for offside and then tested Leeds goalkeeper Shane Higgs with a low shot.
Darlington almost equalised in stoppage-time when defender Mark Bower flashed a header narrowly wide from Gary Smith's corner.
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