Neil Taylor's late own-goal saved 10-man Chelsea as the Swansea City defender denied his side a famous win.
Scott Sinclair returned to haunt his old club with a wonder goal as the ex-Chelsea winger whipped a left-foot effort over Chelsea keeper Petr Cech.
But after Ashley Cole was sent off, Jose Bosingwa made amends for his part in Swansea's goal by helping Chelsea rescue a point in added time.
His low strike deceived Swans keeper Michel Vorm after Taylor's deflection.
The Portugal international's last-minute cross-shot from the right-hand side of the penalty area was not goal-bound until the ball clipped Wales international Taylor and flew past a helpless Vorm.
The goal ensured fourth-placed Chelsea maintained their unbeaten start to 2012 but Andre Villas-Boas's side now trail Tottenham Hotspur in third by seven points following Spurs' win over Wigan Athletic .
Swansea, who would have moved back into the top 10 without Bosingwa's intervention in his 100th Chelsea start, had enough clear chances to win the game.
Danny Graham should have given the hosts, back at full strength after making 10 changes from their FA Cup defeat at Bolton on Saturday, an early lead as he tried to pounce on a loose ball from Gylfi Sigurdsson's right-wing free-kick.
But just as the Swans striker was looking to shoot, Chelsea defender Branislav Ivanovic made a timely intervention.
Graham had an even better opportunity to score following a succession of errors in the visiting defence.
Blues keeper Cech's failed clearance dropped to the feet of Sigurdsson but his shot was cleared off the line by Ivanovic and Graham's goal-bound follow-up was also hacked off the line by David Luiz.
Swansea may have dominated the first half but it was Chelsea, through Daniel Sturridge, who had the best chance when the England striker swivelled to hit Luiz's low left-wing cross just wide of Vorm's left-hand post.
But after absorbing some sustained Chelsea pressure, Swansea took the lead thanks to Sinclair's stunner against the club he left 18 months ago .
Sigurdsson's free-kick was weakly headed away by Bosingwa and Sinclair swung his left-foot to send the ball over Cech and into the far top corner of the Chelsea net, the England under-21 international indulging in only muted celebrations against his old club.
It was Chelsea's turn to dominate after the break, substitute Michael Essien going close with a 25-yard drive early in the second half.
Bosingwa then teased his way to the byline but his hanging cross was headed clear by Angel Rangel, before another surge from the right-back saw Sturridge turn and poke wide.
Chelsea's pressure ensured Swansea struggled to get out of their own territory in the second half but in a rare late attack Kemy Agustien and Luke Moore combined to give Nathan Dyer a sight of goal, but he dragged his shot across the face.
Swansea must have felt they had secured a second successive memorable home triumph - having beaten Arsenal last time out at the Liberty Stadium - when England left-back Cole, who had been cautioned just before the interval, collected a second yellow for a rash tackle on Dyer.
Chelsea, though, never relented as Bosingwa again tricked his way into the box and his driven effort found its way to goal via Taylor.
- 01 Vorm
- 02 Williams
- 03 Taylor Booked
- 04 Caulker
- 22 Rangel Booked
- 07 Britton
- 11 Sinclair (Moore - 77' )
- 12 Dyer
- 24 Allen
- 42 Sigurdsson (Agustien - 67' )
- 10 Graham
- 25 Tremmel
- 16 Monk
- 15 Routledge
- 26 Agustien
- 29 Richards
- 18 Lita
- 19 Moore
- 01 Cech
- 02 Ivanovic
- 03 Cole Dismissed after an earlier booking
- 04 David Luiz
- 17 Bosingwa
- 06 Romeu (Essien - 65' )
- 15 Malouda Booked (Lukaku - 80' )
- 16 Meireles Booked
- 09 Torres
- 10 Mata
- 23 Sturridge
- 22 Turnbull
- 19 Ferreira
- 24 Cahill
- 34 Bertrand
- 05 Essien
- 35 Piazon
- 18 Lukaku
Live Text Commentary
Full Time The final whistle goes and the game is over.90:00 +2:24
Assist on the goal came from Jose Bosingwa.90:00 +2:24 Goal scored
Goal! - Neil Taylor - Swansea 1 - 1 Chelsea Neil Taylor concedes an unfortunate own goal. Swansea 1-1 Chelsea.90:00 +2:21
Jose Bosingwa takes a shot. Neil Taylor gets a block in.90:00 +1:36
Romelu Lukaku takes a shot. Save by Michel Vorm.86:59
David Luiz concedes a free kick for a foul on Nathan Dyer. Free kick taken by Kemy Agustien.86:43
Leon Britton restarts play with the free kick.86:43 Booking
Booking Raul Meireles is shown a yellow card for unsporting behaviour.86:08
Unfair challenge on Nathan Dyer by Raul Meireles results in a free kick.85:04
Angel Rangel takes the free kick.85:04 Dismissal
Dismissal Ashley Cole shown a red card for second bookable offence.85:00
Unfair challenge on Nathan Dyer by Ashley Cole results in a free kick.84:01
Shot on goal by Jose Bosingwa from just inside the area goes over the target.82:49
Effort from the edge of the area by Nathan Dyer goes wide of the left-hand upright.80:21
Angel Rangel gives away a free kick for an unfair challenge on Fernando Torres. Fernando Torres takes the free kick.79:06 Substitution
Substitution Romelu Lukaku on for Florent Malouda.78:41
David Luiz takes a shot. Steven Caulker gets a block in.76:38 Substitution
Substitution Luke Moore comes on in place of Scott Sinclair.76:38
Daniel Sturridge produces a left-footed shot from deep inside the penalty area which goes wide of the right-hand post.74:56
Juan Mata takes a outswinging corner from the left by-line to the near post, Nathan Dyer manages to make a clearance.
Michael Essien gives away a free kick for an unfair challenge on Joe Allen. Direct free kick taken by Joe Allen.70:40
Jose Bosingwa takes a short corner.70:01
Danny Graham challenges David Luiz unfairly and gives away a free kick. Free kick taken by Branislav Ivanovic.68:56
Free kick awarded for an unfair challenge on Kemy Agustien by David Luiz. Steven Caulker restarts play with the free kick.68:13
Michael Essien takes a shot.66:25 Substitution
Substitution Kemy Agustien comes on in place of Gylfi Sigurdsson.65:19
Corner from the right by-line taken by Juan Mata, Branislav Ivanovic takes a shot. Steven Caulker gets a block in. Inswinging corner taken from the right by-line by Juan Mata, Effort on goal by Michael Essien from just outside the penalty area goes harmlessly over the target.64:26 Substitution
Substitution (Chelsea) makes a substitution, with Michael Essien coming on for Oriol Romeu.62:43
Gylfi Sigurdsson fouled by Branislav Ivanovic, the ref awards a free kick. Leon Britton takes the free kick.61:35
David Luiz concedes a free kick for a foul on Gylfi Sigurdsson. Joe Allen takes the direct free kick.58:08
Outswinging corner taken left-footed by Florent Malouda from the left by-line, Jose Bosingwa takes a shot. Blocked by Joe Allen.53:50
Nathan Dyer concedes a free kick for a foul on David Luiz. The free kick is delivered right-footed by Raul Meireles from left channel.53:25
Gylfi Sigurdsson gives away a free kick for an unfair challenge on Raul Meireles. Raul Meireles takes the free kick.52:52
Free kick awarded for a foul by Jose Bosingwa on Scott Sinclair. Free kick taken by Neil Taylor.51:08
Corner taken by Florent Malouda from the left by-line played to the near post, clearance by Danny Graham.50:24
Free kick awarded for a foul by Ashley Williams on Fernando Torres. The free kick is swung in right-footed by Raul Meireles, clearance made by Danny Graham.49:48
Daniel Sturridge challenges Neil Taylor unfairly and gives away a free kick. Ashley Williams takes the free kick.49:01
The assistant referee signals for offside against Danny Graham. David Luiz restarts play with the free kick.48:38
Oriol Romeu has an effort at goal from just outside the box which goes wide of the left-hand upright.47:29
Free kick crossed by Raul Meireles, Steven Caulker manages to make a clearance.47:29 Booking
Booking Angel Rangel shown a yellow card.47:23
Free kick awarded for a foul by Angel Rangel on Florent Malouda.46:12
Oriol Romeu gives away a free kick for an unfair challenge on Joe Allen. Direct free kick taken by Ashley Williams.45:01
The game restarts for the second half.45:00 +1:32 Half time
Half Time The players leave the pitch at half time.45:00 +1:03
Direct free kick taken by Steven Caulker.45:00 +1:03 Booking
Booking Caution for Florent Malouda.45:00 +0:49
Florent Malouda gives away a free kick for an unfair challenge on Leon Britton.44:21
Angel Rangel takes the free kick.44:21 Booking
Booking Ashley Cole shown a yellow card.44:13
Foul by Ashley Cole on Gylfi Sigurdsson, free kick awarded.42:41
Foul by Ashley Cole on Angel Rangel, free kick awarded. Angel Rangel restarts play with the free kick.40:50
Scott Sinclair fouled by Daniel Sturridge, the ref awards a free kick. Neil Taylor restarts play with the free kick.39:58
Foul by Gylfi Sigurdsson on Ashley Cole, free kick awarded. Direct free kick taken by Juan Mata.38:59
Assist by Gylfi Sigurdsson.38:59 Goal scored
Goal! - Scott Sinclair - Swansea 1 - 0 Chelsea Scott Sinclair finds the back of the net with a goal from the edge of the penalty box to the top left corner of the goal. Swansea 1-0 Chelsea.38:10
Free kick awarded for a foul by Juan Mata on Angel Rangel. Gylfi Sigurdsson produces a cross,35:02
Outswinging corner taken right-footed by Raul Meireles from the right by-line, Nathan Dyer manages to make a clearance. Corner taken by Juan Mata, David Luiz takes a shot. Michel Vorm makes a save.33:57
Oriol Romeu takes a shot. Save by Michel Vorm. Outswinging corner taken from the left by-line by Juan Mata, Raul Meireles takes a shot. Clearance by Steven Caulker.33:23
Outswinging corner taken left-footed by Juan Mata from the left by-line, Angel Rangel manages to make a clearance.33:04
Nathan Dyer takes a shot. Save by Petr Cech.32:23
Shot by Juan Mata from deep inside the penalty area misses to the left of the target.30:47
Juan Mata produces a right-footed shot from just outside the box that misses to the right of the goal.29:52
Daniel Sturridge takes a shot. Blocked by Joe Allen. Corner taken left-footed by Juan Mata, Nathan Dyer makes a clearance.25:24
Fernando Torres takes a shot. Blocked by Leon Britton.23:45
Long range effort by Jose Bosingwa goes wide right of the target.20:41
Foul by Ashley Cole on Nathan Dyer, free kick awarded. Steven Caulker takes the direct free kick.20:02
Unfair challenge on Fernando Torres by Ashley Williams results in a free kick. Direct free kick taken by David Luiz.17:38
Daniel Sturridge takes a shot. Save by Michel Vorm.17:12
Joe Allen takes a shot. Save by Petr Cech.15:40
Gylfi Sigurdsson takes a shot. Danny Graham takes a shot. David Luiz gets a block in. Branislav Ivanovic gets a block in.13:06
Branislav Ivanovic takes the free kick.13:06 Booking
Booking The referee shows Neil Taylor a yellow card for unsporting behaviour.13:01
Foul by Neil Taylor on Daniel Sturridge, free kick awarded.12:04
Daniel Sturridge produces a left-footed shot from the edge of the area and misses to the left of the goal.10:36
Danny Graham is ruled offside. Free kick taken by David Luiz.8:33
Short corner taken by Gylfi Sigurdsson from the left by-line.7:48
Ashley Cole challenges Nathan Dyer unfairly and gives away a free kick. Direct free kick taken by Leon Britton.6:26
Unfair challenge on Nathan Dyer by Oriol Romeu results in a free kick. Centre by Gylfi Sigurdsson, Danny Graham produces a left-footed shot from deep inside the penalty box which goes wide of the left-hand upright.3:59
Joe Allen concedes a free kick for a foul on Raul Meireles. Petr Cech takes the free kick.2:54
Raul Meireles challenges Joe Allen unfairly and gives away a free kick. Steven Caulker takes the direct free kick.0:00
The game gets underway.
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