Oldham produced a stunning giant-killing act to down Premier League side Everton 1-0 at Goodison and achieve arguably their finest result since they were in the top flight 14 years ago.
Oldham, who beat Everton in a remarkable three-game tie back in 1990 when only Manchester United stopped them getting to Wembley in the semi-finals, have been in the doldrums since those great days under Joe Royle.
Now in League One, they stunned Everton, with Scottish midfielder Gary McDonald cracking an impressive 20-yard winner in the first half. From then on John Sheridan's side battled for every inch of Goodison Park and fully deserved this victory.
A chip-shop fire opposite the main stand delayed the start for 30 minutes, but once the game got going, Everton made the livelier start. They should have been ahead inside a minute when James Vaughan was clear in the box, only for veteran goalkeeper Mark Crossley to save at his feet.
Alan Stubbs nodded an inviting ball across the six-yard box soon after, with Andrew Johnson not quick enough to take advantage of the glorious chance.
Then Vaughan's control created the space for James McFadden to drive just wide from 10 yards out. But Oldham survived that early burst and started to get forward themselves, with Hughes and Craig Davies prominent.
When Everton did start putting their game together, it took a goal-line clearance from Kelvin Lomax to keep out a James McFadden drive on 41 minutes. But in first-half injury time McDonald struck an excellent goal to give Oldham the lead, sending their 6,000 travelling support wild.
In the early stages of the second period Oldham continued to hold Everton at bay, a long-range free-kick from Lee Carsley that flashed over was all the hosts could muster.
In the end Moyes had to throw on the heavy mob, Yakubu and Victor Anichebe replacing Vaughan and Thomas Gravesen on 64 minutes to beef up Everton's front line.
Oldham had defended manfully to this point, but they knew that it was going to be a barrage from here on as Everton fought to get back into the tie.
However, battling displays from Reuben Hazell, Stefan Stam and Jean Paul Kalala kept Oldham ahead - although Yakubu hit the post in injury time.