AFC Fylde took maximum points thanks to three first-half goals at Boundary Park.
The visitors struck early through Nick Haughton, before doubling their lead through Adam Long.
On the stroke of the half-hour mark, Ethan Mitchell’s header made it three.
Just before the break, Dan Gardner pulled one back for Latics with a well-hit effort just outside the box.
With Latics chasing the game, half-time substitute, Mike Fondop, was sent off for a lunge.
Fylde caused problems from the get-go, winning a free-kick just outside the area as Haughton was brought down.
It was he who stepped up to take it, seeing his well-hit effort bounce off the crossbar and onto Hudson who was beaten by the effort.
The first goal came just a few moments later, as Fylde advanced forward through Bryce Hossan, giving it to Connor Barrett who fed the ball through for Haughton.
Haughton timed his run to perfection, hitting it first time, beating the onrushing Hudson at his near post.
It went from bad to worse for Micky Mellon’s side when the Coasters won a corner after 16 minutes.
The corner came in, and skipped under a Latics boot inside the area, allowing Long to bundle it over the line amongst a sea of bodies inside the box.
It was an unfortunate one to concede, and left Oldham in a tough position after just under 20 minutes.
Haughton looked for his second, flicking the ball up off the ground and striking it on the volley, seeing it go just over the bar to Latics’ relief.
He wouldn’t get another goal, but he did assist Fylde’s third.
After winning a free-kick in a wide, crossing position, Mitchell rose highest to flick on Haughton’s curling cross, putting last season’s National League North winners in a comfortable position.
Three down, Micky knew he had to change things sooner rather than later, sacrificing a midfielder in Oli Hammond to bring Andrew Dallas into the mix.
The deficit was reduced just before the half-time whistle, when Dan Gardner cut in from the left, saw an opening in the defence, firing a neat shot into the far corner, which Theo Richardson had no chance of saving.
Another change in attack was made at the break, with Joe Garner switching places with Mike Fondop, as Oldham looked for a way back into the game.
15 minutes into the second half, after a challenge on Haughton just inside the Latics half, Fondop saw red, leaving Oldham to play the last half hour with ten men.
Oldham had a period of a few half-chances and crosses into the box, but none of them culminated in a goal.
It was following that spell that AFC Fylde arguably came out on the wrong side of a contentious referee decision.
Liam Hogan picked out James Norwood with a long-ball forward, beating the offside trap to Fylde’s surprise.
Richardson rushed out looking to make amends, taking the ball off Norwood, which hit his outstretched arm ten yards outside of the box. Play continued and the away side cleared.
Hallam Hope was brought on with 15 minutes to go in place of Dan Gardner, adding to Latics’ attack.
Oldham: Hudson, Kitching, Hogan, Hobson, Sheron, McGahey, Gardner, Garner, Hammond, Norwood, Conlon.
Subs not used: Norman, Sutton.
AFC Fylde: Richardson, Hosannah, Davis, Long (Graham, 73’), Haughton (Ormerod, 78’), Westley, Barrett, Ustabasi, Conway (Walker, 85’), Whitehead, Mitchell.
Subs not used: Adshead, Hunter.
Attendance: 6,903 (219)
Referee: Robert Massey-Ellis
