The Owls Under-18s emerged triumphant from a five-goal thriller with Cardiff in South Wales.
After seeing Wednesday romp into a 3-0 lead, the Bluebirds struck twice to reduce the deficit but fell short of avoiding defeat.
The visitors were off to the perfect start inside five minutes, with George Hirst’s stunning finish rounding off an impressive four-man move.
Then on 11 minutes the Owls doubled their lead, this time Jordan Lonchar finishing another enterprising attack.
Lonchar, Hirst and Fraser Preston caused all kinds of problems and on 19 minutes it was 3-0.
Hirst showed power and pace to escape his marker before finishing confidently to put Wednesday right in the box seat.
It could have been curtains for Cardiff moments later after Hirst went through one on one but his shot just went past the post, before the striker was unlucky to see a fierce free kick smash against the woodwork.
The home side rallied, though, and struck just before the break to set up a second half that Cardiff edged, hitting a second goal 15 minutes from time.
But Wednesday re-grouped and saw out the game to post a travelling maximum.
Coach Danny Cadamarteri said: “Overall it was a deserved win but the game should have been out of sight after 30 minutes.
“Ultimately, we made the win hard work for ourselves and it was certainly a game of two halves.
“But I thought deserved the win overall, our second on the spin, and we look forward to another game this Thursday at home to Coventry.”