Lenell John-Lewis' second-half header gave Grimsby a narrow away win over mid-table Woking.
The Mariners were denied by outstanding home keeper Aaron Howe until John-Lewis broke the deadlock when he latched on to Jamie Devitt's cross.
Lee Sawyer fired Woking's best chance wide when clean through as the home side dominated the early stages.
Grimsby have already sealed a Blue Square Bet Premier play-off spot while Woking drop to 10th.
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Woking manager Garry Hill told BBC Surrey:
"We didn't create as much as I would have liked and didn't make the chances count, but they caught us on the counter-attack and punished us.
"We've done tremendously this season for a part-time club in a very strong league, with Grimsby a top quality club who have some top players.
"We haven't disgraced ourselves and we've won a lot of friends in the league and you see the ovation at the end, it's a credit to the fans and the players."
Grimsby Town joint manager Rob Scott told BBC Radio Humberside:
"We've always said to keep challenging the players that come into the side - give us something to think about and a few of them there gave a performance that was a better performance than the previous one, and the previous one before that.
"As a group I thought they were excellent and Greg Fleming in goal stepped up to the challenge and was fantastic.
"We had a bad run and everybody had a hoo-ha about it, maybe rightly so. We were never getting too carried away when we were losing games and we are not getting too carried away when we win."