Wednesday were the dominant side throughout a match that saw Cardiff camped in their own half for the most part. Defensive lapses and an inability to double a lead given to them by Anthony Musaba cost them dearly.
There were bright performances from the likes of Marvin Johnson, Will Vaulks, Callum Paterson and Barry Bannan but their dominance didn't turn into vast glut of clear-cut chances with the Bluebirds able to stay in the game.
Karlan Grant and Kion Etete both bundled the ball past Cameron Dawson late in the game via deflections to send the away end into pandemonium and the home side scratching their heads.
1. Cameron Dawson - 4
Outfoxed by a devilish spinning deflection for Cardiff's equaliser on a day he didn't have a huge number of saves to make. Routinely gets too much blame but has to hold his hand up for the second, fumbling Tanner's tame effort into the path of Etete and was slow to jump up.
2. Liam Palmer - 6
The experienced campaigner produced a couple of really well-timed interventions defensively and offered enough going forward to cause a headache or two. Was taken off for Valentin late on.
3. Bambo Diaby - 7
There was a moment in the first half that saw him take out two Cardiff attackers with a pass that would have made Beckenbauer blush. Got forward and defended strongly enough. Off by the time the winner went in.
4. Akin Famewo - 6
Was robust in the face of a meaty Cardiff challenge physically and was unlucky that his attempts to clear resulted in two goal-bound deflections.