Plymouth Argyle extended their lead at the top of the Nationwide Second Division to four points thanks to a headed set-piece goal in either half.
Micky Evans, opened the scoring inside the first ten minutes when he nodded on Graham Coughlan's goalbound header from Ian Stonebridges' corner.
Coughlan then finished a stubborn Wednesday off with 13 minutes to go, heading home directly from Lee Hodges' inswinging flag-kick.
The win leaves the country's leading scorers four points ahead of West Country rivals Bristol City, who were held 1-1 at Ashton Gate by bottom side Wycombe.
Argyle dominated the first half, and the Owls recalled Swedish goalkeeper Ola Tidman was largely responsible for keeping is side within touching distance of the home side.
Tidman diving full-length to turn away a fierce first-time drive from David Norris, and then falling on Marino Keith's close-range header following Hasney Aljofree's curled free-kick.
Wednesday, who introduced former Pilgrim Jon Beswetherick at half-time for injured Graeme Lee, had the best of the second period as Argyle seemed to tire.
Adam Chambers set up Jon Shaw for a shot that Peter Gilbert had to be alert to block, but that was a rare clear sight of goal for the Owls.
Coughlan put Argyle's second-biggest crowd of the season at ease when he headed emphatically past Tidman, and substitute Blair Sturrock nearly fluked a third when he cut in from the left and sent in a low shot.
In the dying moments, Wednesday sprang the offside trap, but Adam Chambers was unable to gain a consolation goal as Luke McCormick saved.
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