Match ends, Alfreton Town 0, Grimsby Town 2.
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."
- 29PhillipsSubstituted forJohnstonat 78'minutes
- 12ShawSubstituted forThanojat 66'minutes
- 11HowellSubstituted forIronsideat 84'minutes
- 7MackrethSubstituted forChapellat 89'minutes
- 34JolleySubstituted forArnoldat 70'minutes
- 18PittmanSubstituted forPalmerat 65'minutes
- Darren England
- Shots on Target
Second Half ends, Alfreton Town 0, Grimsby Town 2.
Corner, Grimsby Town.
Attempt saved. Jordan Chapell (Grimsby Town) right footed shot from outside the box is saved.
Attempt missed. Ollie Palmer (Grimsby Town) right footed shot from outside the box misses to the left.
Substitution, Grimsby Town. Jordan Chapell replaces Jack Mackreth.
Goal! Alfreton Town 0, Grimsby Town 2. Lenell John-Lewis (Grimsby Town) header from the centre of the box to the bottom left corner. Assisted by Craig Clay with a cross.
Foul by Craig Clay (Grimsby Town).
Jake Speight (Alfreton Town) wins a free kick.
Substitution, Alfreton Town. Joe Ironside replaces Anthony Howell.
Offside, Alfreton Town. Jake Speight tries a through ball, but Jake Speight is caught offside.
Attempt saved. Jack Mackreth (Grimsby Town) left footed shot from the right side of the box is saved.
Attempt missed. Craig Clay (Grimsby Town) right footed shot from outside the box misses to the right.
Karl Hawley (Alfreton Town) hits the bar with a left footed shot from the left side of the six yard box.
Foul by Craig Disley (Grimsby Town).
Andi Thanoj (Alfreton Town) wins a free kick.
Substitution, Alfreton Town. John Johnston replaces Jimmy Phillips.
Foul by Anthony Howell (Alfreton Town).
Jack Mackreth (Grimsby Town) wins a free kick.
Attempt blocked. Lenell John-Lewis (Grimsby Town) right footed shot from the left side of the box is blocked.