Match ends, Lincoln City 1, Cambridge United 0.
Cambridge United suffered back-to-back defeats after Ben Tomlinson's penalty secured all three points for Lincoln.
Lincoln pressed from the off, Harrison Dunk's goalline clearance preventing Tomlinson from opening the scoring.
But the 24-year-old striker was then awarded a penalty after his shot struck the arm of Tom Bonner, and he slotted home for his 17th of the season.
The visitors' disappointing afternoon was compounded when Ryan Donaldson was sent off for a second bookable offence.
Lincoln City manager Gary Simpson told BBC Radio Lincolnshire:
"I thought we were terrific today, I don't think Nick (Townsend) had a shot to save and we should have had a few more I think with the football that we played.
"I said to the players that I wanted to win these last few games and we've set about it. We won last week, won this week and now it's Wrexham on Monday and then finish with Barnet and I want to get as many points as we can.
"We want to finish well. We had a bad couple of months but apart from that we haven't done too badly. I've kept saying that on our day we're a match for anybody and on today's showing we are."
- 26AdamsBooked at 34minsSubstituted forRoweat 85'minutes
- 12SheridanBooked at 77minsSubstituted forArthurat 81'minutes
- 7DonaldsonBooked at 80mins
- 10ElliottSubstituted forBarnes-Homerat 63'minutes
- 23ChambersBooked at 45mins
- 11DunkSubstituted forSam-Yorkeat 46'minutes
- Darren England
- Shots on Target
Second Half ends, Lincoln City 1, Cambridge United 0.
Offside, Cambridge United. Matthew Barnes-Homer tries a through ball, but Matthew Barnes-Homer is caught offside.
Attempt saved. Kris Bright (Lincoln City) right footed shot from the left side of the box is saved.
Corner, Lincoln City.
Substitution, Lincoln City. Danny L. Rowe replaces Charlee Adams.
Offside, Lincoln City. Ben Tomlinson tries a through ball, but Ben Tomlinson is caught offside.
Substitution, Lincoln City. Koby Arthur replaces Jake Sheridan.
Second yellow card to Ryan Donaldson (Cambridge United) for a bad foul.
Foul by Ryan Donaldson (Cambridge United).
Charlee Adams (Lincoln City) wins a free kick.
Foul by Charlee Adams (Lincoln City).
Liam Hughes (Cambridge United) wins a free kick.
Jake Sheridan (Lincoln City) is shown the yellow card for a bad foul.
Corner, Cambridge United.
Foul by Arnaud Mendy (Lincoln City).
Ryan Donaldson (Cambridge United) wins a free kick.
Corner, Lincoln City.
Attempt missed. Matthew Barnes-Homer (Cambridge United) right footed shot from outside the box misses to the left.
Substitution, Cambridge United. Matthew Barnes-Homer replaces Tom Elliott.