Two quick fire first half goals from Chris O’Grady and Gevaro Nepomuceno handed Latics the three points at the Globe Arena.
It was a quiet start to the game with both defences seemingly in charge of the contest.
Morecambe had the first chance after a quick free kick caught out Latics, but Rhys Oates could only find the side netting when released into the box.
The game suddenly came to life after Oldham scored two goals in as many minutes through O’Grady and Nepomuceno.
Morecambe couldn’t defend a Rob Hunt ball in from the right and O’Grady volleyed home past Mark Halstead in the hosts’ goal.
The same build from Oldham worked a minute later as Hunt’s ball was headed up into the air by Zak Mills and Nepomuceno reacted quickest to smash it into the net.
Morecambe almost halved the deficit as Josef Yarney rose highest from a corner, but Daniel Iversen saved brilliantly low to his right.
Latics had to dig deep in the second half and Frankie Bunn was thankful for the form of Iversen in goal.
Liam Mandeville cut inside from the left and forced another great save from the Dane, diving to his left.
Oldham almost had a third when an Andy Taylor freekick whipped in from the right which resulted in a goalmouth scramble, but somehow it ended up cleared away when it looked set to be a goal.
A-Jay Leitch-Smith found himself one on one moments later after a mistake from Peter Clarke, but Iversen spread himself well to deny the striker.
Then came the moment of the game and an unbelievable piece of goalkeeping from Iversen.
The ball came in from the left onto the head of substitute Kevin Ellison about two yards out and Iversen somehow manged to tip it away low to his right to the astonishment of the Morecambe fans.
Latics managed to hold on to take all three points and extend the unbeaten run to four games.
Attendance: 3050 (Away 1638)
Morecambe Line Up:
Halstead, Mills, Conlan, Old, Fleming, Oswell (Oliver 71’), Yarney, Wildig ©, Mandeville, Oates (Ellison 79’), Leitch-Smith
Oldham Athletic Line Up:
Iversen, Hunt, Edmundson, Clarke ©, Taylor, Branger-Engone (Graham), Gardner, Missilou (Maouche 83’), Nepomuceno, Baxter (Lang 63’), O’Grady