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.
9. Marvin Johnson - 3
Linked well with James on the left to begin with but struggled thereon. Set piece delivery could have been better but he was threatening in moments. Didn't do nearly enough to stop the crosses for Peterborough's goals. Photo: UGC/Steve Ellis
10. Lee Gregory - 7
Everywhere. Puts in such a shift and is such a clever player. After his 'fits and starts' start to the season, will be keen to grab a goal from somewhere and put a run of form together. Did well in trying circumstances and was brought off for future battles, you'd think. Photo: UGC/SWFC
11. Callum Paterson - 5
Had a dangerous shot deflected wide after 20 minutes and worked his proverbials off all evening - particularly important when down to 10 men. Ultimately didn't produce enough. Photo: UGC/Steve Ellis
12. Dominic Iorfa - 5
On amongst the carnage of Byers' exit. Looked OK for the main part, but doesn't quite seem to have his timing. Photo: UGC/Steve Ellis