Peterborough capped a memorable week by claiming bragging rights with a 1-0 win at managerless arch-rivals Cambridge.

Having reached the EFL Trophy final on Tuesday, Posh grabbed the decisive goal 10 minutes into the second half.

In a seemingly unthreatening position, Ephron Mason-Clark delivered a cross from the left which evaded everyone in the box before finding the far corner of Jack Stevens’ net.

Their pressure had been building before half-time, with Archie Collins clipping the top of the bar from the edge of the box and the unmarked Kwame Poku somehow firing Malik Mothersille’s cross wide.

The hosts – who saw manager Neil Harris leave this week to return to Millwall – threatened themselves, with Jed Steer saving well from Jack Lankester’s effort and from the resulting corner Elias Kachunga headed in before being denied by the offside flag.

Having scored the opener, Mason-Clark nearly turned provider but substitute Hector Kyprianou thumped his effort onto the bar before Joel Randall’s shot was deflected just wide.

Cambridge’s big chance to equalise came on 80 minutes but Danny Andrew fired narrowly wide from 20 yards.

Peterborough boss Darren Ferguson felt his side should have been more ruthless following the 1-0 victory over struggling Fleetwood at Highbury Stadium.

A goal from Archie Collins just before the break proved to be the difference as Ferguson’s side made it five League One games without defeat.

In a first half that was dominated by the visitors, United had plenty of chances to take the lead with Ricky-Jade Jones and Kwame Poku coming close in the opening moments.

But Peterborough eventually broke the deadlock in the 43rd minute when Collins’ long-range effort deflected past Fleetwood goalkeeper Jay Lynch before nestling in the bottom corner.

Posh could have extended their lead in the second half when Lynch brilliantly stopped Jones’ close-range header while Posh goalkeeper Nicholas Bilokapic denied Ben Heneghan in the dying moments as the home side almost grabbed an unlikely equaliser.

Peterborough are now in the League One automatic-promotion places after four wins in their last five.

Ferguson said: “It should have been at least three after 10 minutes but it wasn’t. We started the game how I wanted us to with the authority we’ve got.

“But we’ve just got to be more ruthless, we’ve blown teams away at times but away from home against a team that’s not in form, if we get that second goal it kills the game.

“It wasn’t comfortable at the end and, ultimately, we’re hanging on in a game that should have been very comfortable.

“It was a good game to watch, I just wish we could have been more ruthless, but it’s another win and another clean sheet.

“The clean sheets are going to be key and if we can keep clean sheets like we have been then we’re going to have a bit of a chance.

“You’ve got to come to these places and beat what’s in front of you and today we did that.”

Defeat was Fleetwood’s sixth in a row in all competitions and they have not found the net in almost 10 hours of football.

Manager Lee Johnson said: “I think it’s been a massive effort to get that performance.

“I thought we rode our luck a little bit in the first 15 or 20 minutes but I think we did OK.

“I thought we defended OK and worked really hard and we went 4-4-2 to try and be more positive in the game.

“We had two golden chances really, in the first half with Josh Earl and then with Ben Heneghan at the end.

“We weren’t without chances and it’s another game where we haven’t scored and another game that we’ve conceded.

“On a positive note, I thought it was excellent to see how many of our academy players were in and around the first-team squad today and that’s nice to see.

“But we can’t be victims and we have to be fighters. We’ve got to get through January and we’ve got to get through this season and then I’m certain that this time next year the complexity of the league position changes.”