The effort was there for the Owls, particularly after Reece James was adjudged to have produced an over-zealous tackle in the first half and was sent off with a straight red card, but Wednesday barely laid a glove on their opponents across the 90 minutes as things fell away from them.
Peterborough are a top side at this level and defeat – Wednesday’s first of the season – is no disgrace, but Darren Moore and his staff may well be furious with the manner of the goals they conceded, once again from crosses.
There were too many ineffectual performances on a night Moore shuffled his pack in selection.
Here are our player ratings from an eventful evening.
5. Liam Palmer - 6
Strapped on the captain's armband and continued a solid start to his season. Dependable on a night things went a bit south. Photo: UGC/Steve Ellis
6. George Byers - 4
Combative and pushed the ball around OK, but let himself down with a public fracas with his assistant manager Jamie Smith. We don't know what was said of course, but whatever his role, it's needless story that will run a touch, you'd think - Wednesday simply don't need that. Photo: UGC/Steve Ellis
7. Will Vaulks - 5
Calm on the ball and did his job quietly but well. Could have had his first Owls goal early in the second half but for an incredible save from Bergstrom. Yellow'd soon afterwards. Throws it miles. Photo: UGC/Steve Ellis
8. Tyreeq Bakinson - 5
Brought energy to midfield after his weekend heroics and at times was stationed left, right and centre. Battled, but in terms of a sustained impact on the game? Nope. Photo: UGC/Steve Ellis