Match ends, Cambridge United 0, Luton Town 1.
Mark Cullen scored with nine minutes remaining to give Luton a narrow win at 10-man Cambridge.
Cullen followed up his own penalty, which was saved by Chris Dunn following Richard Tait's foul on Pelly Ruddock, to fire in on the rebound.
This came after Tom Naylor, making his United debut after signing on loan from Derby, was shown a straight red for a poor tackle on Jim Stevenson.
Ruddock had hit the bar with a shot for Luton before the dismissal.
Luton manager John Still told BBC Three Counties Radio:
On goalscorer Mark Cullen: "He scored a really important goal last year, and a really important goal this year. And you know what, a good player will score important goals so I'm pleased for him.
"I think we cancelled each other out first half. We started out with a system we had to change and it was difficult, but once we could talk it through at half-time we thought it was better."
On injuries: "It's really difficult for us at the minute, but that team ethic is what gets you through."
- 4CoulsonBooked at 82mins
- 7DonaldsonBooked at 64mins
- 11DunkSubstituted forDialloat 72'minutes
- 33NaylorBooked at 54mins
- 15SimpsonBooked at 37minsSubstituted forHurstat 77'minutes
- 24WilliamsSubstituted forDruryat 28'minutes
- 28StevensonBooked at 47mins
- 17Ruddock Mpanzu
- 21GuttridgeSubstituted forRobinsonat 82'minutes
- 10WallBooked at 56minsSubstituted forLafayetteat 59'minutesBooked at 60mins
- Graham Salisbury
- Shots on Target
Second Half ends, Cambridge United 0, Luton Town 1.
Foul by Greg Taylor (Cambridge United).
Andy Drury (Luton Town) wins a free kick on the left wing.
Liam Hurst (Cambridge United) wins a free kick on the left wing.
Foul by Pelly Ruddock (Luton Town).
Ryan Donaldson (Cambridge United) wins a free kick in the attacking half.
Foul by Mark Cullen (Luton Town).
Attempt missed. Jim Stevenson (Luton Town) right footed shot from outside the box is close, but misses to the left.
Attempt missed. Greg Taylor (Cambridge United) right footed shot from outside the box is just a bit too high.
Attempt missed. Greg Taylor (Cambridge United) left footed shot from the centre of the box is close, but misses to the left.
Corner, Cambridge United. Conceded by Alex Lacey.
Josh Coulson (Cambridge United) is shown the yellow card.
Substitution, Luton Town. Matt Robinson replaces Luke Guttridge.
Goal! Cambridge United 0, Luton Town 1. Mark Cullen (Luton Town) right footed shot from the centre of the box to the bottom right corner.
Penalty saved! Mark Cullen (Luton Town) fails to capitalise on this great opportunity, right footed shot saved in the bottom right corner.
Penalty conceded by Richard Tait (Cambridge United) after a foul in the penalty area.
Penalty Luton Town. Pelly Ruddock draws a foul in the penalty area.
Attempt saved. Tom Elliott (Cambridge United) header from the centre of the box is saved in the top centre of the goal.
Corner, Cambridge United. Conceded by Mark Cullen.