The Owls and Swansea must meet again in the fifth round of the FA Cup following a 0-0 draw at Hillsborough.
An entertaining but ultimately goalless game saw Wednesday keeper Cameron Dawson take the plaudits with a stunning save to deny Mike van der Hoorn.
That apart, real talking points were few, with the main topic off the pitch the return of former Owls boss Carlos Carvalhal.
Wednesday’s best chance came as early as the second minute when Jacob Butterfield sent Adam Reach in on goal and Kristoffer Nordfeldt got his angles right to divert for a corner.
The hosts went on to more than hold their own against their Premier League opponents, who had to dine on scraps as the first half unfolded.
Kyle Naughton had a snapshot deflected wide on the half-hour mark but that was from a rare foray into the final third.
Then, eight minutes before the break, the visitors fashioned the best chance of the half and Wednesday had Dawson to thank for keeping the game on an even keel.
Naughton found room down the right to cross for the advancing van der Hoorn and the Dutchman’s header was firm and goal-bound – but Dawson showed super athleticism to twist and tip over the bar.
The Owls ended the first 45 with Reach glancing a Ross Wallace corner narrowly over and they headed down the tunnel having enjoyed the better of the cup clash.
The second period started with little spark, although Wednesday continued to ask more of the questions.
Swansea were limited to attack on the counter and Jordan Ayew saw a low shot from distance comfortably saved by Dawson.
Moments later, fellow substitute Nathan Dyer was thwarted by the Owls’ custodian as Swansea began to up the ante.
Wednesday responded with Atdhe Nuhiu showing some trickery in the box before forcing Nordfeldt into a save low at his near post.
Jos Luhukay introduced Lucas Joao for the closing stages and as the clock ticked down, it seemed neither side favoured a replay.
But the deadlock could not be broken and the tie heads for a replay at the Liberty Stadium the week beginning Monday 26 February.
Wednesday: Dawson, Hunt, Venancio, Pudil, Fox, Reach, Butterfield (Pelupessy 70), Jones, Boyd, Wallace (Joao 80), Nuhiu