An encouraging first half hour was stopped in an instant as Pol Valentin was adjudged to have fouled his tormentor Josh Ginnelly in the box. From there things spiralled.
Wednesday were passive and unable to muster anything in the way of attacking promise - their defensive efforts scrappy and well punished.
It leaves the Owls still without a win this campaign having playes eight league matches - and two in the cup.
They are the only team yet to win a game after round eight of the Championship season.
Here are our player ratings from a horror trip to South Wales.
9. John Buckley - 5
Showed quick-thinking to set up attacks on two occasions and was the brightest of Wednesday’s players in an encouraging opening half-hour. From there, he faded fast and was taken off. | Steve Ellis / UGC
10. Anthony Musaba - 6
Couldn’t get his feet in order to get a shot off in Wednesday’s first chance of the piece but grew into the game and offered some bright moments, sometimes in tight areas. Missing in action in the second half. | UGC / Steve Ellis
11. Lee Gregory - 4
Could he have shot with that early chance squared to Musaba? Picked up good positions and forced a good save from Rushworth on 20 minutes but that was about as good as it got. | UGC / Steve Ellis
12. Callum Paterson - 4
On for Delgado on 55 minutes. Worked hard as ever but showed little quality from wide and got lost in a swirling Owls performance. | UGC / Steve Ellis