Second-half goals from Scott Garner and Liam Hearn helped Grimsby come from behind to beat local rivals Lincoln.
Cambridge loan man Conal Platt gave the Imps a 33rd minute lead after a jinking run, before Garner headed the Mariners level from Michael Coulson's corner.
Hearn's 18th goal of the season just past the hour, latching on to Craig Disley's pass, proved to be the winner.
Anthony Elding hit a post from another corner by Coulson but that miss did not prove costly as Grimsby held on.
VIEWS FROM THE DRESSING ROOM
Lincoln City manager David Holdsworth told BBC Lincolnshire:
"In the first half we were fantastic but really we paid the price of not putting the chances away.
"You want that second goal and I think if we'd got that we would have gone on to be worthy winners.
"But that's football, and a 10-minute spell in the second half has cost us."
Grimsby Town joint-manager Paul Hurst told BBC Radio Humberside:
"The first half certainly belonged to Lincoln and I thought we dominated most of the second half and looked dangerous.
"I kind of threw it back to the players at half-time, not to give me excuse of the way the formation Lincoln were playing.
"I just thought we were second best really but thankfully we got a reaction and we played something like we can in the second."
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Live Text Commentary
Full Time The referee ends the match.90:00 +4:54
Direct free kick taken by Jason Beardsley.90:00 +4:54 Booking
Booking Frankie Artus is shown a yellow card for unsporting behaviour.90:00 +4:44
Unfair challenge on Jason Beardsley by Frankie Artus results in a free kick.90:00 +3:10 Booking
Booking James McKeown booked for time wasting.90:00 +2:41
Alan Power produces a right-footed shot from just outside the box that goes wide right of the goal.90:00 +0:12
Michael Coulson produces a right-footed shot from outside the penalty box and misses right.87:54
Simon Russell challenges Bradley Wood unfairly and gives away a free kick. Michael Coulson restarts play with the free kick.84:12
Corner taken right-footed by Michael Coulson from the right by-line, Scott Garner produces a right-footed shot from just outside the box that goes wide right of the goal.81:03
Corner taken right-footed by Conal Platt, Alan Power takes a shot. Comfortable save by James McKeown.79:48
Jean Francois Christophe has an effort at goal from outside the box which goes wide right of the target.78:34
Foul by Scott Garner on Jake Sheridan, free kick awarded. Alan Power restarts play with the free kick.75:08 Substitution
Substitution Simon Russell on for Tyrone Thompson.74:49
Inswinging corner taken by John Nutter from the right by-line.72:55
Alan Power produces a strike on goal direct from the free kick, save by James McKeown.72:55 Booking
Booking Shaun Pearson is booked.72:03
Free kick awarded for an unfair challenge on Conal Platt by Shaun Pearson.70:11
Frankie Artus fouled by Jake Sheridan, the ref awards a free kick. Direct free kick taken by Bradley Wood.69:02
Corner taken right-footed by Michael Coulson from the left by-line, Anthony Elding produces a header from close range which bounces off the post.68:15 Substitution
Substitution Kyle Perry comes on in place of Francis Laurent.
Outswinging corner taken by Michael Coulson from the right by-line.63:07
Corner from right by-line taken by Conal Platt.62:15
Effort from inside the area by Anthony Elding misses to the right of the goal.60:20
Assist on the goal came from Craig Disley.60:20 Goal scored
Goal! - Liam Hearn - Lincoln 1 - 2 Grimsby Goal scored by Liam Hearn from inside the penalty box to the bottom left corner of the goal. Lincoln City 1-2 Grimsby.59:06 Substitution
Substitution Jason Beardsley replaces Josh Gowling.57:45
Scott Garner has a headed effort at goal from close range which goes wide of the left-hand upright.57:04 Booking
Booking Josh Gowling booked.56:41
Foul by Josh Gowling on Liam Hearn, free kick awarded. Free kick taken by Michael Coulson.56:05
Outswinging corner taken by Conal Platt, save by James McKeown.55:50
Josh Gowling takes a shot. Scott Garner gets a block in.55:11
Free kick awarded for an unfair challenge on Alan Power by Michael Coulson. Direct free kick taken by John Nutter.51:53
Michael Coulson provided the assist for the goal.51:53 Goal scored
Goal! - Scott Garner - Lincoln 1 - 1 Grimsby Scott Garner grabs a headed goal from inside the six-yard box. Lincoln City 1-1 Grimsby.51:31
Corner taken by Michael Coulson,51:03
Michael Coulson takes a short corner, Josh Gowling manages to make a clearance.50:06
Emmanuel Panther has an effort at goal from outside the area which goes wide left of the target.48:33
Jake Sheridan gives away a free kick for an unfair challenge on Emmanuel Panther. Bradley Wood takes the direct free kick.48:09
Emmanuel Panther concedes a free kick for a foul on Jean Francois Christophe. Tony Sinclair restarts play with the free kick.46:12
Bradley Wood produces a right-footed shot from just outside the box that misses to the right of the net.45:01
The referee starts the second half.45:01 Substitution
Substitution Frankie Artus joins the action as a substitute, replacing Luke McCarthy.45:00 +3:39 Half time
Half Time The referee calls an end to the first half.45:00 +3:23
Tyrone Thompson has an effort at goal from just outside the penalty box which goes wide of the left-hand post.45:00 +2:28
Conor Townsend fouled by Conal Platt, the ref awards a free kick. Direct free kick taken by Conor Townsend.45:00 +1:22
Alan Power concedes a free kick for a foul on Shaun Pearson. Free kick taken by James McKeown.45:00 +0:53
Anthony Elding takes a shot. Save made by Paul Farman.44:41
Luke McCarthy produces a cross, save by Paul Farman.42:43
Anthony Elding is ruled offside. Paul Farman takes the direct free kick.41:46
Free kick awarded for an unfair challenge on Alan Power by Scott Garner. Free kick taken by John Nutter.41:06
Foul by Craig Disley on Conal Platt, free kick awarded. Paul Farman restarts play with the free kick.38:42
The official flags Luke McCarthy offside. Free kick taken by Paul Farman.37:30
Corner taken right-footed by Michael Coulson.34:00
The referee blows for offside. Free kick taken by Paul Farman.32:37 Goal scored
Goal! - Conal Platt - Lincoln 1 - 0 Grimsby A goal is scored by Conal Platt from inside the six-yard box to the bottom left corner of the goal. Lincoln City 1-0 Grimsby.28:06
Conal Platt has an effort at goal from just outside the box which goes wide of the right-hand upright.27:04
Free kick awarded for an unfair challenge on Francis Laurent by Bradley Wood. John Nutter takes the direct free kick.23:57
Anthony Elding concedes a free kick for a foul on Jean Francois Christophe. Direct free kick taken by John Nutter.18:55 Substitution
Substitution Charlie I'Anson leaves the field to be replaced by Scott Garner.18:23
Outswinging corner taken by Michael Coulson, Emmanuel Panther has a headed effort at goal from close range which goes wide left of the target.16:34
The assistant referee flags for offside against Anthony Elding. Paul Farman restarts play with the free kick.15:01
Jake Sheridan delivers the ball.13:12
Conal Platt fouled by Bradley Wood, the ref awards a free kick. John Nutter takes the free kick. Francis Laurent takes a shot. Save by James McKeown.9:05
Inswinging corner taken from the left by-line by Michael Coulson.8:08
The referee penalises Conal Platt for handball. James McKeown restarts play with the free kick.6:37
Free kick awarded for a foul by Conor Townsend on Alan Power. Direct free kick taken by Tony Sinclair.6:12
Jean Francois Christophe takes a shot. James McKeown makes a save.2:13
Jake Sheridan challenges Bradley Wood unfairly and gives away a free kick. Free kick taken by James McKeown.0:00
The game kicks-off.
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