Dundalk FC saw off close neighbours Drogheda United 1-0 at United Park on Thursday evening.
The only goal of the game came from Connor Malley in the 65th minutes.
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But Dundalk had goalkeeper Nathan Shepperd to thank for taking all three points from the Louth derby.
He saved a 87th minute Freddie Draper penalty as the Lilywhites climbed to third in the league table.