The Hatters Under-18s are out of the FA Youth Cup following a disappointing 3-0 defeat at Peterborough United tonight.
Inigo Idiakez's side went into the second round tie at the ABAX Stadium confident of progression after beating the Posh in EFL Youth Alliance action on Saturday.
But they found themselves a goal down just after the half-hour mark when Oli Shackleton netted for Posh, with Josh Boorn having the Hatters' only attempt of the first half soon after.
Town came closest to levelling in the 56th minute when captain Jake Peck played a free-kick low across the penalty area for Corey Panter, whose left-footed shot rattled the crossbar.
Posh had a goal disallowed soon after, but it didn't take them long to increase their lead when Town centre-half Dequane Wilson-Braithwaite put past his own keeper in the 67th minute.
Connor Tomlinson, who netted all four in the previous round's win over Brentwood Town, had a chance to drag the Town back into the game after a weak back-pass from Mikkel Fosu, but his right-footed shot flew over.
It was left to Fosu himself to complete the scoring with five minutes to go, when a Jack Gurney free-kick was headed back across goal for him to fire past Parker and make it 3-0.
TOWN: Parker, Jones (Wilson 70), Panter, Wilson-Braithwaite, Richardson (Beckwith 57), Peck, Tomlinson, Neufville, Kalonda, Byron, Boorn (Lucas 65). Unused subs: Holden, Swindells.
POSH: Blackmore, Douglas, Fosu, Barker, Garner, Jones, Clarke (Rolt 81), Gurney, Shackleton, Ricky-Jade Jones (Brookes 88), Burrows (Strachan 86). Unused subs: Allen, Salmon.