F91 Dudelange 2-1 UCD (Agg: 2-2; UCD win on away goals)
A headed strike from Ryan Swan gave ten-man UCD their vital away goal before a tenacious defensive display earned them a remarkable Europa League passage in Luxembourg.
Their match winner in the first leg at the UCD Bowl last week, 19-year-old Swan struck again to give his side an early lead over F91 Dudelange at the Stade Jos Nosbaum.
However, left-back Sean Coyne then being shown a straight red card on 28 minutes spelled big trouble for UCD.
Dudelange duly stormed back into the game to score twice before half-time.
But try as they might in the second half, the Luxembourgers could find no way past an inspired Niall Corbet in the Students' goal as UCD gallantly hung on to record arguably the biggest night in their history.
Manager Collie O’Neill, who only arrived in the Grand-Duchy at lunchtime due to his wife, Jenny, being (still) overdue on their third child, now brings his youngsters to meet Slovak side Slovan Bratislava in the second round next week.
And the club bank another €210,000 to add to the €200,000 secured for qualifying.
The game was just 35 seconds old when UCD were awarded a free kick just outside the box after Clayton De Sousa chopped down Jamie Doyle, receiving a yellow card.
Gary O’Neill curled the free kick over the top. It was the early confidence boost UCD would have wanted.
And though Dudelange soon threatened twice through David Turpel, UCD stunned their hosts to take the lead on the night on 17 minutes.
Mark Langtry’s throw on the right was flicked on by Doyle for Swan to head home.
Dudelange responded with Turpel shooting into the side-netting from left-back Romain Ney’s cross.
Corbet was then well positioned to hold a thumping header from Stelvio Rosa Cruz before going full stretch to his left to palm away a drive from Daniel Da Mota.
The game looked to have fatally turned against UCD on 28 minutes when Coyne was shown a straight red card for a lunging tackle on Kevin Nakache.
Midfielder Dylan Watts was sacrificed as Maxim Kouogun came on in a rejigged back four.
The Students were livid minutes later when Pedro received only a yellow card for what appeared an elbow on UCD central defender Tomas Boyle.
The home side then got right back into the game with two goals at the end of the half.
They levelled on 43 minutes from Joel Pedro whose cracking left-foot drive from 20 yards found the top corner of the net.
Then, three minutes into added time, Dudelange were ahead on the night when Nakache headed home Da Mota’s long throw.
The woodwork rescued UCD four minutes into the second half as Turpel rattled the bar from the edge of the area.
Pedro was then just inches wide with a downward header from Roman Ney’s cross.
Corbett, booked for time wasting just before, came into his own when pushing away a free kick from Rosa Cruz as the pressure mounted.
The busy College keeper then excelled with a brilliant stop with his feet from Ney who had been played in by Pedro.
Corbet was there yet again on 64 minutes with another save to turn Rosa Cruz’s low shot from distance round a post.
Once more, ten minutes later, Corbet sprung to his right to palm away a drive from Pedro as UCD hung on until the final whistle.
F91 Dudelange: Jonathan Joubert; Clayton Da Sousa (Sanel Ibrahimovic 65), Tom Schnell, Jerry Prempeh, Romain Ney; Kevin Nakache; Sofian Benzouien (Gregory Adler 71), Joel Pedro, Stelvio Rosa Cruz, Daniel Da Mota (Alexanfre Lauriente 76); David Turpel.
UCD: Niall Corbet; Mark Langtry, Michael Leahy (Adam Harney 79), Tomas Boyle, Sean Coyne; Gary O’Neill; Chris Mulhall, Robbie Benson, Dylan Watts (Maxim Kouogun, 31), , Jamie Doyle; Ryan Swan (Samir Belhout 67).
Referee: Rahim Hasanov (Azerbaijan).