Mansfield had keeper Alan Marriott to thank for their point at Grimsby as the Stags recorded a 10th draw this season in 23 Blue Square Bet Premier games.
Marriott made a string of early saves from Michael Coulson, Liam Hearn and Luke McCarthy, before John Thompson cleared the loose ball off the line.
The Stags keeper then tipped Coulson's second-half shot over the bar.
Ex-Mansfield striker Rob Duffy came off the bench late on and nearly grabbed the winner against his former club.
But Marriott again proved unbeatable, this time using his feet to beat the ball away and preserve his clean sheet.
VIEW FROM THE DRESSING ROOM
Grimsby Town joint boss Paul Hurst told BBC Radio Humberside:
"I thought we put in a big effort. On another night we could have quite easily won that.
"We had the better chances, and probably just had that bit of luck missing.
"It was difficult because I think teams now are looking at the last scoreline we had against Stockport and come and get men behind the ball, and that's what they did tonight."
Mansfield manager Paul Cox told BBC Radio Nottingham:
"The performance could have been better but the result at the end of the day was, I think, a good point.
"Through the majority of the games this season sometimes Mazza hasn't been called upon within the 90 minutes, and I think he's come here tonight and put in an exceptional performance.
"At times, he's probably kept us in the game but that's what he's paid to do and on nights like this, you need an outstanding player, when we had one or two that were probably off the boil, to get us the point."