Match ends, Blackpool 0, Sheffield Wednesday 1.
Blackpool are 17 points adrift of Championship safety as their winless run stretched to eight games with a defeat at home to Sheffield Wednesday.
Watford loanee Lewis McGugan's third goal in five games was enough to earn Wednesday their third win in four league matches.
McGugan's curling free-kick from the left evaded everyone to find the net after the break.
Blackpool rarely threatened throughout.
It was a bad day for the bottom three, with Millwall and Wigan also losing, but Rotherham's victory at Huddersfield leaves Blackpool in even further danger.
The victory leaves Wednesday in 10th but, 13 points adrift of the top six, it would take a remarkable run of results to reignite their promotion hopes.
The visitors controlled a poor encounter, with McGugan shooting over the bar early on before striker Atdhe Nuhiu missed a free header at the back post.
Jamie O'Hara curled a free-kick over the bar in a rare Blackpool attack before McGugan fired the Owls into a deserved lead.
Wednesday dominated possession and had more shots on goal than Blackpool, who look certain to be playing League One football next season.
Blackpool manager Lee Clark: "It's getting a bigger miracle by the week that needs to happen for us to stay up.
"I'm 100% confident I'll be here next season, from the conversations I have had with the chairman.
"I want the players to stake a claim to be part of the overhaul that I'll be doing to try and get the club back to the Championship at the first attempt.
"There will be huge changes in playing personnel and how we structure everything."
Sheffield Wednesday manager Stuart Gray: "It's our 18th clean sheet of the season and we deserve credit for that.
"Obviously credit has to go to the goalkeeper and the back four but we defend from the front and you needed to do that on a pitch like this.
"It was very hard to play any kind of decent football on this pitch, it just wasn't conducive to knocking the ball around."
- 27BarkhuizenBooked at 53minsSubstituted forClarkeat 71'minutesBooked at 77mins
- 20OliverSubstituted forOsavi-Samuelat 60'minutes
- 34TelfordBooked at 70mins
- 22Cubero Loria
- 15LeesBooked at 15mins
- 35DielnaBooked at 70mins
- 17HelanBooked at 80mins
- 4HutchinsonSubstituted forVermijlat 18'minutes
- 48KeaneSubstituted forMattockat 88'minutes
- 9NuhiuBooked at 38mins
- Graham Scott
- Shots on Target
Second Half ends, Blackpool 0, Sheffield Wednesday 1.
Jeremy Helan (Sheffield Wednesday) wins a free kick in the defensive half.
Foul by Peter Clarke (Blackpool).
Attempt blocked. Jeremy Helan (Sheffield Wednesday) left footed shot from the left side of the box is blocked. Assisted by Chris Maguire with a headed pass.
Corner, Sheffield Wednesday. Conceded by David Ferguson.
Substitution, Sheffield Wednesday. Joe Mattock replaces Will Keane.
Attempt missed. Nathan Delfouneso (Blackpool) right footed shot from outside the box is high and wide to the right. Assisted by Bright Samuel with a headed pass.
Attempt blocked. Jeremy Helan (Sheffield Wednesday) right footed shot from outside the box is blocked.
Corner, Sheffield Wednesday. Conceded by Dominic Telford.
Attempt blocked. Chris Maguire (Sheffield Wednesday) right footed shot from the right side of the box is blocked.
Atdhe Nuhiu (Sheffield Wednesday) wins a free kick on the left wing.
Foul by Miles Addison (Blackpool).
Attempt missed. Grant Hall (Blackpool) header from the centre of the box misses to the left. Assisted by Jamie O'Hara with a cross following a set piece situation.
Jeremy Helan (Sheffield Wednesday) is shown the yellow card for a bad foul.
Foul by Jeremy Helan (Sheffield Wednesday).
Bright Samuel (Blackpool) wins a free kick on the right wing.
Attempt saved. Marnick Vermijl (Sheffield Wednesday) right footed shot from the right side of the box is saved in the bottom right corner. Assisted by Liam Palmer.
Attempt missed. Dominic Telford (Blackpool) left footed shot from the centre of the box misses to the left. Assisted by Nathan Delfouneso with a headed pass.
Peter Clarke (Blackpool) is shown the yellow card.