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.

13. Josh Windass - 5
Bright when on for Buckley on 55 minutes, stinging a cross into the box. It all went south from there and he was powerless to the decay, launching hopeful balls forward. | UGC / Getty Images




