Northampton's routine win piled more misery on struggling Lincoln City.
The Cobblers went ahead before the break when Dean Beckwith reacted first to smash the ball home after Billy McKay's shot rebounded off the post.
Adbul Osman's header struck the bar on the hour mark, but John Johnson went one better when he nodded home Ryan Gilligan's corner.
Delroy Facey's wayward header was City's best chance, leaving boss Steve Tilson winless since taking the helm.
Lincoln City manager Steve Tilson told BBC Lincolnshire: "I thought we did okay in the first half even though we conceded a goal, but the second half disappointed me. I felt we gave them too much respect, too much time on the ball and we got punished with another set play.
"We put some decent balls in to the box but we've got to be a little bit braver. I don't mind people getting in the box and missing, it's when they're not getting in there that concerns me.
"Everything's been positive since I came in but the second half worried me, if I'm honest."
Northampton Town manager Ian Sampson tells BBC Radio Northampton: "It's another three points and we've turned the corner slightly, although there's still a long way to go. I was pleased with the performance, it was very professional.
"We knew it was going to be tough tonight in difficult conditions, very windy, but we were very solid and scored the goals at the right time. We were possibly unfortunate that we didn't score three or four.
"There's not a lot between the teams and sometimes you need some luck. Tonight, we didn't need that luck because we were the better side."
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