Grimsby kept pace in the hunt for automatic promotion with victory at struggling Alfreton Town.
Grimsby debutant Josh Gowling broke the deadlock midway through the second half, firing Jack Mackreth’s cross into the bottom corner.
Mackreth then hit a post with an angled shot from the edge of the area and Alfreton striker Karl Hawley steered a close-range effort onto the crossbar.
Lenell John-Lewis headed home Craig Clay’s cross to secure the points.
The Mariners remain three points behind league leaders Barnet while Alfreton stay in 20th, six points above the bottom four.
Grimsby Town manager Paul Hurst told BBC Radio Humberside:
“I felt we started the game right and then it slowed a bit, but that was the problem.
“I think the lads felt like they were in control, but it was too slow.
“The longer it went on I did feel that our fitness and fresh legs would come through and again I think that showed.”