Match ends, Wrexham 0, Grimsby Town 1.
Grimsby Town spoiled Wrexham's 150th anniversary by beating their hosts at the Racecourse Ground.
Grimsby took the lead when Mark Carrington brought down Aswad Thomas in the box and Lenell John-Lewis tucked the penalty into the corner of the net.
Elliott Durrell's second-half introduction off the bench sparked life into a strangely subdued Wrexham.
But the Dragons' hopes of a comeback ended when Louis Moult was sent off for a late challenge on Craig Disley.
More than 8,000 fans had turned up for the match in north Wales, a huge crowd for a Conference game.
Wrexham manager Kevin Wilkin told BBC Radio Wales: "To get such a fantastic gate and to play in the manner that we did for long spells of the first half was really disappointing.
"We came out and gave a better account of ourselves up until the sending off in the second half.
"We had Grimsby camped in and it's important you keep 11 men on the field.
"I didn't see what the sending off was for but on my understanding it was for a stamp, if that's the case we can't have any complaints."
Grimsby Town boss Paul Hurst told BBC Radio Humberside:
"I thought we handled the occasion well, with the exception of giving a corner away in the first 10 seconds.
"I thought we calmed the crowd down early on, got on the ball, played some good football and passed it quite well, and certainly looked a threat
"We missed a good chance through Jack Mackreth before we got the penalty and Lenny tucked one away very coolly"
- 2CarringtonBooked at 27mins
- 5HudsonSubstituted forHolmanat 87'minutes
- 3AshtonBooked at 33mins
- 12KeatesSubstituted forDurrellat 54'minutes
- 9MoultBooked at 79mins
- 10BishopSubstituted forJenningsat 78'minutes
- 1McKeownBooked at 72mins
- 5PearsonBooked at 40mins
- 4BrownBooked at 90mins
- 16ClaySubstituted forDisleyat 21'minutes
- 11NeilsonSubstituted forArnoldat 64'minutes
- Brett Huxtable
- Shots on Target
Second Half ends, Wrexham 0, Grimsby Town 1.
Scott Brown (Grimsby Town) is shown the yellow card for a bad foul.
Foul by Lenell John-Lewis (Grimsby Town).
Neil Ashton (Wrexham) wins a free kick.
Substitution, Wrexham. Dan Holman replaces Blaine Hudson.
Foul by Wes York (Wrexham).
Aswad Thomas (Grimsby Town) wins a free kick.
Attempt missed. Connor Jennings (Wrexham) right footed shot from outside the box misses to the left.
Louis Moult (Wrexham) is shown the red card for fighting.
Foul by Louis Moult (Wrexham).
Craig Disley (Grimsby Town) wins a free kick.
Substitution, Wrexham. Connor Jennings replaces Andy Bishop.
Attempt blocked. Louis Moult (Wrexham) right footed shot from outside the box is blocked.
James McKeown (Grimsby Town) is shown the yellow card for a bad foul.
Foul by James McKeown (Grimsby Town).
Wes York (Wrexham) wins a free kick.
Attempt missed. Nathan Arnold (Grimsby Town) right footed shot from outside the box is too high.
Substitution, Grimsby Town. Nathan Arnold replaces Scott Neilson.