Grimsby and AFC Wimbledon shared the points in their Sky Bet League Two curtain-raiser at Blundell Park.
Mariners goalkeeper Jake Eastwood was the hero as he saved a second-half penalty from Ali Al-Hamadi on debut to earn his side a point.
The Dons’ best chances aside from the penalty came in quick succession around the 34th minute as Ryan Johnson won two headers from back-to-back corners.
Despite Grimsby’s bright start to the second half, the visitors were gifted a golden opportunity to go ahead in the 59th minute as Harry Clifton brought down Al-Hamadi in the box.
He stepped up to take the penalty, which was saved well by Eastwood down to his left, with a double save made in the end by the Grimsby stopper to deny Al-Hamadi on the follow-up.
Buoyed by the penalty save, the hosts went down the other end a few minutes later with defender Harvey Rodgers having a shot from outside the area saved by the visiting goalkeeper Alex Bass.
Abo Eisa went close to scoring the only goal but his long-range effort was tipped onto a post by Bass.