Danny North pounced midway through the second half to earn Grimsby all three points against strugglers Wrexham. Wrexham started promisingly and new signing Paul Hall made an instant impression with a snap-shot that keeper Phil Barnes somehow kept out.
Grimsby's Nick Hegarty and Paul Bolland then both wasted fine scoring chances.
But the breakthrough came when a long ball from Tom Newey dropped behind the defence and North raced in to lob advancing Dragons keeper Gavin Ward.
Grimsby: Barnes, Atkinson, Fenton (Whittle 81), Newey, Hird (Till 46), Hegarty, Bolland, Hunt, Clarke (Toner 61), Jones, North. Subs Not Used: Montgomery, Taylor.
Booked: Hunt.
Goals: North 68.
Wrexham: Ward, Bolland, Steve Evans, Hope, Spender, Valentine, Mark Jones (Fleming 72), Roberts, Sonner, Marc Williams (Proctor 81), Hall.
Subs Not Used: Anthony Williams, Pejic, Done.
Att: 4,084
Ref: Graham Salisbury (Lancashire).
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