Barnsley conceded a costly Olivier Ntcham equaliser as they lost ground in the fight for Sky Bet Championship survival with a 1-1 draw at Swansea.
Claudio Gomes fired Barnsley into the lead in the 54th minute, but Ntcham's leveller 10 minutes later left the Tykes 10 points from safety, with relegation rivals Reading and Peterborough both winning on Friday.
Swansea dominated the final stages in south Wales and pushed hard for a winner, but they ultimately missed a chance to boost their slim play-off hopes.
The draw leaves Russell Martin's side 14th, seven points off the top six with five games to play.
Swansea looked dangerous on the counter-attack, with Jamie Paterson curling in a wicked cross which connected with Joel Piroe only for it to be saved by Jack Walton. Barnsley's Matthew Wolfe was then shown a yellow card for a bad foul.
The hosts wasted a glorious chance to go ahead when Paterson could not make the most of a three-on-one. Michael Obafemi played it to Paterson, who cut back on his right foot but saw his effort blocked by Mads Andersen.
Barnsley's best opportunity of the first half came when Liam Kitching was found unmarked but headed wide. The game was goalless at the interval and Barnsley had Walton to thank for that, with his acrobatic save keeping out Matt Grimes' powerful shot.
Swansea began the second half on the front foot, with Ben Cabango's left-footed shot from the edge of the penalty area going just wide.
Barnsley opened the scoring as they broke away on the counterattack, catching Swansea out with their pace. Amine Bassi played Gomes through on goal, with the striker drilling it through Andy Fisher's legs in the 54th minute.
But Swansea refused to throw in the towel and went on the attack, with Cyrus Christie's pass in the 64th minute allowing Ntcham to rifle the ball into the top corner.
Barnsley attempted to seize the initiative back from the Welsh club, but Wolfe missed an open goal when he fired wide. Callum Brittain also failed to make the most of a good opportunity when his right-footed shot from the centre of the box missed to the right.
This game was now being played at a frantic pace, and Barnsley's Carlton Morris was shown a yellow card for a late tackle. As the game approached the final 10 minutes, Swansea laid siege to their visitors' box.
The closest Swansea came was when Obafemi, who was played in by Hannes Wolf, had his left-footed shot blocked by Barnsley captain Andersen.
The visitors had one final chance to claim a winner, but Cauley Woodrow could not get his shot on target.
What the managers said
Barnsley's Poya Asbaghi: "Overall, over the full 90 minutes, to come here to Swansea and be the better team, it's a good performance even though we didn't get the result. We are in a situation where we have to depend on other results. What we need to do with five games left is show the same spirit that we showed in this game.
"This was not a team which showed any signs of giving up anything. We get a good counter-attack to score the goal which put us 1-0 ahead. After that we even hit the post to make it 2-0, but instead Swansea equalise to make it 1-1. It was a really decisive moment in the game. I don't think any team can come here, in any game almost, and win the possession, but it's about creating the most chances, and I believe if we look at this game overall, we are the ones who created the best chances."
Swansea's Russell Martin: "We lacked the energy and intensity of the last three games. We conceded a real poor goal, but our mentality was good when we dragged ourselves back into it. It's really frustrating that we've dropped two points. We created some great chances, but we lacked a bit of composure and calmness.
"We have five games left to make a real impact on our position in the table. I think the whole season has been about learning. I think the players have learnt a hell of a lot. I've learnt a lot throughout the season, all of us have as a coaching staff. All of it prepares us really well and puts us in a much better position for next season, especially the way the players have learnt and grown together."