Wrexham made the perfect start by opening the scoring after just five minutes. Cannon blasted a powerful low effort past goalkeeper Harvey Cartwright from the edge of the box to make it 1-0. The midfielder was celebrating again on the 36th minute after neatly finishing off a flowing counter to double the visitors' lead. There was even time for another goal before the break, captain Paul Mullin swivelling in the penalty area and sending a left-footed volley into the net.
Wrexham had more chances after the break but Eoghan O'Connell fired over the bar and Mullin also wasted an opportunity after rounding the goalkeeper. Grimsby did manage to pull one back late on when Arthur Gnahoua cut inside and fired a shot past Arthur Okonkwo but it was to prove only a consolation for the hosts as the Red Dragons moved up to second in the table.