Jason Scotland scored the only goal of the game to help Swansea claim a 1-0 win over Huddersfield and take a step closer to the Coca-Cola League One title.
The Trinidad and Tobago international turned in Ferrie Bodde's corner from close range on the stroke of half-time to give Roberto Martinez's side victory at the Galpharm Stadium, which extended their lead to 14 points.
Huddersfield's misery was compounded by the late dismissal of former Wales defender Robert Page for a second-bookable offence in the 82nd minute, while Scotland was stretchered off in added time with an ankle injury.
Doncaster midfielder James Coppinger netted in the second minute to give his side a 1-0 win over fellow promotion hopefuls Tranmere at Prenton Park.
The result means Sean O'Driscoll's side leapfrogged Carlisle and Nottingham Forest, who meet at the City Ground on Monday night, into the second automatic promotion place.
Stefan Moore scored in the fourth minute to keep Walsall's play-off hopes on track with a 1-0 win over Luton, who are now 11 points adrift of the safety zone in 23rd place.
Tresor Kandol kept Leeds' hopes of making the play-offs alive with a 25th-minute winner at Swindon.
But Leyton Orient's play-off bid took a hit after they were held to a 1-1 draw at Brighton. Jabo Ibehre's 80th-minute strike looked like it had given Orient the points but Nicky Forster's penalty in injury-time handed his side a share of the spoils.
Crewe remained in the relegation zone despite a battling 0-0 draw at Northampton.
The Railwaymen are separated only on goal difference from Gillingham, who were held to goalless draw by a Yeovil side reduced to 10 men when Stephen Maher was sent off.
Millwall are only a point above the drop-zone after Craig Disley scored in second-half injury-time to give FA Cup quarter-finalists Bristol Rovers a 1-0 win at the Memorial Stadium.
Sam Vokes (6, 45) grabbed a brace to help Bournemouth clinch a 2-0 win over Hartlepool but the Cherries are still 11 points short of the safety mark.
Bottom side Port Vale suffered their 10th home defeat of the season as they were thrashed 3-0 by Oldham. Jordan Robertson (23), Neal Eardley (78) and Matthew Wolfenden (90) were all on the scoresheet for the visitors.
Huddersfield's misery was compounded by the late dismissal of former Wales defender Robert Page for a second-bookable offence in the 82nd minute, while Scotland was stretchered off in added time with an ankle injury.
Doncaster midfielder James Coppinger netted in the second minute to give his side a 1-0 win over fellow promotion hopefuls Tranmere at Prenton Park.
The result means Sean O'Driscoll's side leapfrogged Carlisle and Nottingham Forest, who meet at the City Ground on Monday night, into the second automatic promotion place.
Stefan Moore scored in the fourth minute to keep Walsall's play-off hopes on track with a 1-0 win over Luton, who are now 11 points adrift of the safety zone in 23rd place.
Tresor Kandol kept Leeds' hopes of making the play-offs alive with a 25th-minute winner at Swindon.
But Leyton Orient's play-off bid took a hit after they were held to a 1-1 draw at Brighton. Jabo Ibehre's 80th-minute strike looked like it had given Orient the points but Nicky Forster's penalty in injury-time handed his side a share of the spoils.
Crewe remained in the relegation zone despite a battling 0-0 draw at Northampton.
The Railwaymen are separated only on goal difference from Gillingham, who were held to goalless draw by a Yeovil side reduced to 10 men when Stephen Maher was sent off.
Millwall are only a point above the drop-zone after Craig Disley scored in second-half injury-time to give FA Cup quarter-finalists Bristol Rovers a 1-0 win at the Memorial Stadium.
Sam Vokes (6, 45) grabbed a brace to help Bournemouth clinch a 2-0 win over Hartlepool but the Cherries are still 11 points short of the safety mark.
Bottom side Port Vale suffered their 10th home defeat of the season as they were thrashed 3-0 by Oldham. Jordan Robertson (23), Neal Eardley (78) and Matthew Wolfenden (90) were all on the scoresheet for the visitors.
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