The Owls posted a crucial win at in-form Oldham on Saturday with a second half wonder goal from David Prutton and Ryan Lowe's late penalty proving the difference on a cold afternoon in Lancashire.
Prutton stole the show on 62 minutes with a stunning strike that put Wednesday ahead before Lowe iced the cake with a coolly taken spot-kick to collect all three points.
Oldham took the plaudits for an impressive first half display but failed to take advantage of the upper hand, allowing Wednesday to raise a gear after the break and seal the win.
Gary Megson shuffled his pack for the trip over the Pennines, bringing Prutton into midfield and introducing loanee Sanchez Watt alongside Chris O'Grady up front.
But the first action of note came at the other end just three minutes in when Latics skipper Dean Furman drilled in a long ranger that whistled past the post.
Oldham - unbeaten in six games and having won their last three on home soil - continued the bright start and could have taken lead on nine minutes.
Robbie Simpson swung an accurate corner into the mix and former Owls striker Shefki Kuqi was afforded the time to plant a firm header that flew narrowly over the bar.
Wednesday responded with Ben Marshall curling a delicious free kick that brushed the roof of the net but Oldham came straight back with Simpson forcing Stephen Bywater into action following a good move in and around the penalty area.
Bywater came to Wednesday's rescue just before the interval with a fine save after Simpson broke free on goal and the home side saw out the remainder of the first half having shaded possession but not the scoreline.
Lowe came on for Marshall at the start of the second period and sniffed out an opportunity ten minutes in but Latics keeper Alex Cisak stood firm and kept out the striker's shot with a good stop.
But Cisak could do nothing about Prutton's strike just past the hour. The recalled midfielder beat two defenders with some exquisite ball control before blasting into the far corner in front of the 3,700-strong travelling army.
The Latics were on the back foot as the Owls turned the screw and Gary Megson's men duly wrapped up the win five minutes from the end.
Simpson was adjudged to have fouled Watt in the area and up stepped Lowe to send Cisak the wrong way and cement Wednesday's second-placed slot in League 1.
Oldham: Cisak, Yves M'Voto (Tarkowski 56), Black, Diamond, Furman, Simpson, Adeyemi (Smith 75), Parker (Morais 69), Lee, Scapuzzi, Kuqi
Unused substitutes: Bouzanis, Mancini
Wednesday: Bywater, Tavernier, Batth, Jones, R Johnson, Watt (Bennett 87), Semedo, Lines, Prutton, Marshall (Lowe 46), O'Grady
Unused substitutes: O'Donnell, J Johnson, Morrison