Alan Shearer had the last laugh against tenacious Grimsby as he struck an 80th-minute winner to send Newcastle through to the Carling Cup fourth round.Shearer required three stitches in his lip at half-time after being elbowed in a challenge with Mariners skipper Justin Whittle.But he seized his single chance to sweep the winner past Steve Mildenhall just when it looked like the League Two side were going to take the tie into extra-time.
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