Match ends, Grimsby Town 1, AFC Telford United 0.
Nathan Arnold's second-half goal helped Grimsby condemn Conference bottom club AFC Telford to a third straight defeat.
The midfielder could have opened the scoring midway through the first half but goalkeeper Freddy Hall saved well.
But Gregor Robertson then set up Arnold on 47 minutes to fire his fourth of the season before Lenell John-Lewis curled a shot against the bar for Grimsby.
John-Lewis missed from close range but one goal was enough for the Mariners to record their fifth win in seven games.
Telford remain 10 points adrift of safety, with 12 matches left, while Grimsby are eight points off top spot with a game in hand.
Grimsby Town manager Paul Hurst told BBC Radio Humberside:
"We dominated the game and should have won by more. That's my criticism to the players.
"We missed a lot of chances. That's something we've got to do better. We won't always get away with that and perhaps haven't done at times this season.
"Realistically we dominated the game but it could have been a different press conference we're having now.
"At the same time we would have had ourselves to blame in that we didn't get a second and make it a lot more comfortable. "
AFC Telford manager Steve Kittrick told BBC Radio Shropshire:
"When you're part-time, coming to a full-time club who are fourth in the league, you've got to be at your best. We just need that bit of quality.
"One or two of those lads playing for Grimsby were playing in the Football League last year.
"For the first 20 minutes in the first half we played well and controlled it for a bit. But we switched off two minutes into the second half for their goal.
"I always say the first 10 minutes and the last 10 win or lose you a game. You've got to be switched on and we weren't."
- 16ClaySubstituted forBrownat 72'minutes
- 34JolleySubstituted forPittmanat 72'minutes
- 24VentreBooked at 79mins
- 6GroganSubstituted forClancyat 61'minutes
- 27SharpsBooked at 27mins
- 22ReaSubstituted forPokuat 66'minutes
- 10GrayBooked at 18mins
- 18SmithSubstituted forMatthewsat 61'minutes
- Richard Wigglesworth
- Shots on Target
Second Half ends, Grimsby Town 1, AFC Telford United 0.
Corner, Grimsby Town.
Attempt missed. Tony Gray (AFC Telford United) right footed shot from outside the box misses to the right.
Foul by Ross Dyer (AFC Telford United).
Gregor Robertson (Grimsby Town) wins a free kick.
Attempt missed. Lenell John-Lewis (Grimsby Town) right footed shot from the left side of the six yard box misses to the left.
Danny Ventre (AFC Telford United) is shown the yellow card for a bad foul.
Foul by Danny Ventre (AFC Telford United).
Carl Magnay (Grimsby Town) wins a free kick.
Foul by Godfrey Poku (AFC Telford United).
Craig Disley (Grimsby Town) wins a free kick.
Substitution, Grimsby Town. Jon-Paul Pittman replaces Christian Jolley.
Substitution, Grimsby Town. Scott Brown replaces Craig Clay.
Attempt saved. Christian Jolley (Grimsby Town) left footed shot from the right side of the box is saved.
Attempt missed. Lenell John-Lewis (Grimsby Town) right footed shot from outside the box misses to the left.
Offside, Grimsby Town. Lenell John-Lewis tries a through ball, but Lenell John-Lewis is caught offside.
Substitution, AFC Telford United. Godfrey Poku replaces Jack Rea.
Foul by Lenell John-Lewis (Grimsby Town).
Ian Sharps (AFC Telford United) wins a free kick.