Another brilliant freekick from Blair Spittal sent Dundee United into the last 16 of the William Hill Scottish Cup.
Just as he had done in the Dundee derby a week earlier, the talented youngster sent a setpiece from outside the box floating into the net to put his team 1-0 up.
Unlike in that Dens game, though, the Tangerines would hang on to their 79th-minute lead to deservedly beat Airdrie in this fourth round tie at the Excelsior Stadium and get their name into Monday night’s draw.
It was their first win since beating Ross County in the Premiership on October 31.
United made two changes to the line-up that started against Dundee last weekend.
Out went suspended duo Gavin Gunning and Ryan McGowan to be replaced by Mark Durnan and Coll Donaldson.
New striker Riku Riski, just signed on the eve of the match, had to make do with a place on the bench.
The same went for Robbie Muirhead as he returned from his loan spell with Partick Thistle, while there was a welcome return from long-term injury for Paul Paton as he was also named as a sub.
Chris Erskine had a decent effort from distance for United but the ball flew a foot or so over the Diamonds’ bar.
Skipper Sean Dillon then did well to clear at the back post as Airdrie threatened Eiji Kawashima’s on 15 minutes.
With 17 minutes gone, Paul Dixon rattled the home bar with a shot from outside the box then Spittal pounced on the rebound only for goalie Rohan Ferguson to save his low strike.
United tried again from long range on 30 minutes, this time Scott Fraser having a go, but the first half finished goalless.
With just a couple minutes of the second period gone, the Tangerines cut the Diamonds wide open.
Dixon started the move off by finding Fraser, who bobbed and weaved before sliding a pass right to Billy Mckay.
The striker looked certain to score but pulled his shot to the side of the goal when he should have at least hit the target.
On 55 minutes, United were on the attack again and Fraser’s volley went into the ground then over after he was found by a Dixon cross from the left.
Donaldson wasn’t far away with a shot from 30 yards then Erskine had another low strike saved as the Tannadice men continued to dominate without scoring.
Riski made his debut when he replaced Erskine on 67 minutes before Fitzpatrick saved the Diamonds with a great save to keep out a Fraser shot from just outside the box.
A foul on Fraser just outside the area on 79 minutes gave the visitors a great opportunity and Spittal produced his magic again to send the fans wild, with some even spilling on to the trackside to celebrate.