Chelsea were searching for a seventh straight league win
Wigan produced a massive shock with a victory over 10-man Chelsea which ended the Blues' 100% record and knocked them off the top of the Premier League.
A close-range Titus Bramble header gave Wigan a first-half lead, but Didier Drogba equalised from close range.
Petr Cech then conceded a penalty and was dismissed for a foul on Hugo Rodallega, who scored from the spot.
Wigan put the result beyond doubt when the impressive Paul Scharner tapped-in from a Maynor Figueroa cross.
Martinez hails dominant display
Latics manager Roberto Martinez had called on his players to "create history" by defeating one of the top four for the first time in the club's Premier League history.
Few gave his side a chance against a team which had started the season impeccably and were looking to equal their best start to a Premier League season with a seventh straight victory.
It had seemed that Chelsea, unbeaten since March, had forgotten how to lose, and with Wigan forced to tenaciously defend in the early part of the match it seemed the visitors' impressive run of results would continue.
Wigan's opener, from a clever play at a short corner, may have come against the run of play, but Martinez's men out-played, out-muscled and out-thought the visitors for the majority of the match.
For the first goal, Charles N'Zogbia collected the ball and disorientated the Chelsea defence with a menacing cross which Bramble met for the simplest of headers.
Onlookers held their breaths for the much-expected Chelsea onslaught, but it never materialised as Wigan dominated.
Jason Scotland, making his first Premier League start, forced a last-ditch tackle from John Terry, while only a fine reflex save from Cech prevented Emmerson Boyce from doubling the advantage from four yards, after another well-worked short corner.
Cheers greeted Martinez's men as they left the pitch at the break but within 90 seconds of the restart it was the visiting fans who were making the most noise.
A mazy run from Florent Malouda created space for Drogba, who scored his 100th goal for the club with a shot which trickled through Chris Kirkland's legs.
The Wigan goalkeeper should have done better but his team soon regained the lead in dramatic circumstances as Cech conceded a penalty and was sent off for his misdemeanour.
We didn't play well - Ancelotti
Cech, sprawled on the ground, seemed to trip Rodallega with a protruding leg as the Columbian surged towards goal, and with referee Phil Dowd deeming the goalkeeper to be the last defender the red card was subsequently shown.
Henrique Hilario replaced Malouda but the substitute goalkeeper could do little to prevent Rodallega scoring with a thunderous penalty down the middle.
Chelsea had few clear opportunities, the best coming to Frank Lampard who was off target with the header.
It went from bad to worse as Chelsea went down to nine men with Cole going off injured and in stoppage-time the effervescent Scharner scored the third after good work down the left by Figueroa.
From the deafening noise at the final whistle it was clear that the Wigan fans' long wait for a victory over one of the top four - this was their 35th attempt - was well worth it.
Wigan manager Roberto Martinez:
"When you are Wigan and playing against the top four you have options, you can be brave and beat them or you can get hammered.
"That is what happened. We were beaten 4-0 and 5-0 (by Arsenal and Man Utd) and here the only reason we won is because we learned our lessons.
"We have been brave from the first moment and no-one can say we did not deserve the win. That is a big compliment to our club.
"This is for the fans, who have been with us through the bad times and supported us all well. The great thing from my point of view was our reaction to conceding a goal. We continued to be positive."
Chelsea coach Carlo Ancelotti
"It was a bad display. I don't know why we didn't play well but these things can happen after many wins.
"Wigan played better than us. They were well organised and played well. This was the right result.
"We played well in the first 10 minutes but when we lost the first goal it became more complicated."
90:00+5:09 The referee blows his whistle to end the game.
90:00+4:16 John Terry has an effort at goal from deep inside the area missing to the right of the target.
90:00+2:17 Inswinging corner taken right-footed by Juliano Belletti, Titus Bramble makes a clearance.
90:00+0:38 The assist for the goal came from Maynor Figueroa.
90:00+0:38 GOAL - Paul Scharner:Wigan 3 - 1 Chelsea Paul Scharner fires in a goal from inside the six-yard box to the bottom right corner of the goal. Wigan 3-1 Chelsea.
90:00+0:03 Mario Melchiot gives away a free kick for an unfair challenge on Michael Essien. Michael Essien takes the indirect free kick.
87:52 Substitution (Wigan) makes a substitution, with Marlon King coming on for Jason Scotland.
86:25 Foul by Michael Essien on Jason Scotland, free kick awarded. Free kick taken by Titus Bramble.
86:02 Booking Michael Essien goes into the book for unsporting behaviour.
85:14 The assistant referee signals for offside against Charles N'Zogbia. Indirect free kick taken by Henrique Hilario.
84:19 Salomon Kalou takes a shot. Blocked by Titus Bramble.
82:50 Frank Lampard has a header from deep inside the six-yard box and clears the crossbar.
82:10 Free kick awarded for an unfair challenge on John Terry by Jason Scotland. Ashley Cole restarts play with the free kick.
81:39 John Terry gives away a free kick for an unfair challenge on Charles N'Zogbia. Direct free kick taken by Mario Melchiot.
79:36 Effort on goal by Salomon Kalou from just inside the area clears the bar.
79:09 Jason Scotland is caught offside. John Terry takes the indirect free kick.
77:57 Hugo Rodallega has a shot on goal from outside the box which misses right.
75:14 Ashley Cole concedes a free kick for a foul on Charles N'Zogbia. Direct effort from the free kick comes in from Hugo Rodallega.
73:16 Ashley Cole is penalised for handball and concedes a free kick. Free kick taken by Chris Kirkland.
71:11 The referee blows for offside. Indirect free kick taken by Henrique Hilario.
69:34 Free kick taken by Mohamed Diame.
69:34 Booking Ricardo Carvalho receives a caution.
69:29 Free kick awarded for an unfair challenge on Hugo Rodallega by Ricardo Carvalho.
67:29 Substitution Salomon Kalou comes on in place of Jose Bosingwa.
67:29 Effort on goal by Paul Scharner from 35 yards missed to the left of the goal.
62:59 Hendry Thomas takes a long range shot clearing the crossbar.
57:24 Free kick awarded for an unfair challenge on Maynor Figueroa by Nicolas Anelka. Free kick taken by Emmerson Boyce.
55:57 Didier Drogba produces a right-footed shot from close in that clears the bar.
54:46 Nicolas Anelka takes a shot. Blocked by Emmerson Boyce. Corner taken by Frank Lampard, Charles N'Zogbia makes a clearance.
Corner from the left by-line taken by Didier Drogba, Titus Bramble manages to make a clearance.
52:48 Assist on the goal came from Jason Scotland.
52:48 GOAL - Hugo Rodallega:Wigan 2 - 1 Chelsea Penalty taken right-footed by Hugo Rodallega and scored. Wigan 2-1 Chelsea.
Correction - 50:22 Substitution Henrique Hilario is brought on as a substitute for Florent Malouda.
50:22 Substitution (Chelsea) makes a substitution, with Henrique Hilario coming on for Florent Malouda.
50:22 Sent off Petr Cech sent from the field by the ref for professional foul.
Correction - 50:11 Unfair challenge on Hugo Rodallega by Petr Cech results in a Penalty.
50:11 Petr Cech challenges Hugo Rodallega unfairly and gives away a Penalty.
49:36 Michael Essien is penalised for handball and concedes a free kick. Chris Kirkland takes the indirect free kick.
48:39 Jose Bosingwa delivers the ball, clearance by Hendry Thomas. Corner taken by Frank Lampard from the right by-line, John Terry
takes a shot. Blocked by Mohamed Diame. Inswinging corner taken from the right by-line by Florent Malouda, Paul Scharner makes
47:39 Mohamed Diame has an effort at goal from outside the area missing to the wide right of the target.
46:29 Florent Malouda provided the assist for the goal.
46:29 GOAL - Didier Drogba:Wigan 1 - 1 Chelsea Didier Drogba scores a goal from close in to the bottom left corner of the goal. Wigan 1-1 Chelsea.
45:56 Foul by Maynor Figueroa on Juliano Belletti, free kick awarded. Free kick taken by Jose Bosingwa.
45:01 The game restarts for the second half.
45:01 Substitution Mikel leaves the field to be replaced by Juliano Belletti.
45:00+3:12 The referee calls an end to the first half.
45:00+2:06 The referee gives a free kick against Didier Drogba for handball. Chris Kirkland restarts play with the free kick.
45:00+1:27 Michael Essien challenges Hendry Thomas unfairly and gives away a free kick. Free kick taken by Emmerson Boyce.
45:00+0:21 Free kick awarded for an unfair challenge on Michael Essien by Hugo Rodallega. Jose Bosingwa takes the free kick.
43:58 Unfair challenge on Michael Essien by Mohamed Diame results in a free kick. Frank Lampard delivers the ball from the free
kick right-footed from left channel, Hendry Thomas manages to make a clearance.
41:58 Effort on goal by Didier Drogba from just inside the penalty area goes over the target.
41:19 Inswinging corner taken by Frank Lampard from the left by-line, save by Chris Kirkland.
40:50 Free kick awarded for a foul by Maynor Figueroa on Jose Bosingwa. Michael Essien takes the free kick.
38:15 Emmerson Boyce takes a shot. Save made by Petr Cech.
37:41 Short corner worked by Hugo Rodallega.
36:36 Inswinging corner taken by Charles N'Zogbia from the right by-line played to the near post, Frank Lampard manages to make
30:14 Jose Bosingwa produces a cross.
29:34 Michael Essien challenges Mohamed Diame unfairly and gives away a free kick. Chris Kirkland restarts play with the free kick.
28:35 Shot from just outside the box by Paul Scharner goes over the bar.
26:48 Direct effort from the free kick comes in from Didier Drogba, save by Chris Kirkland.
26:48 Booking Hendry Thomas booked for unsporting behaviour.
26:18 Free kick awarded for an unfair challenge on Didier Drogba by Hendry Thomas.
24:42 Foul by Michael Essien on Charles N'Zogbia, free kick awarded. Shot comes in from Charles N'Zogbia from the free kick, Petr
Cech makes a save.
24:25 Paul Scharner takes a shot. Save by Petr Cech.
23:45 The referee blows for offside against Jason Scotland. Free kick taken by Ricardo Carvalho.
22:55 Free kick awarded for an unfair challenge on Titus Bramble by Didier Drogba. Chris Kirkland takes the free kick.
20:28 Didier Drogba is penalised for a handball. Free kick taken by Titus Bramble.
20:08 Charles N'Zogbia takes a shot. Save by Petr Cech.
18:12 Didier Drogba is ruled offside. Indirect free kick taken by Chris Kirkland.
17:29 Unfair challenge on Mikel by Jason Scotland results in a free kick. Frank Lampard restarts play with the free kick.
16:57 Titus Bramble restarts play with the free kick.
15:26 The assist for the goal came from Charles N'Zogbia.
15:26 GOAL - Titus Bramble:Wigan 1 - 0 Chelsea Titus Bramble grabs a headed goal from deep inside the penalty area. Wigan 1-0 Chelsea.
15:07 Corner taken by Hugo Rodallega,
13:31 Jason Scotland takes a shot. Save by Petr Cech. Corner taken left-footed by Charles N'Zogbia from the right by-line, clearance
by Michael Essien.
10:46 The referee blows for offside. Free kick taken by Chris Kirkland.
9:35 Frank Lampard produces a right-footed shot from just outside the box that goes wide left of the goal.
7:57 Mikel challenges Mohamed Diame unfairly and gives away a free kick. Direct effort from the free kick comes in from Hendry
Thomas, save by Petr Cech.
6:29 Florent Malouda fouled by Paul Scharner, the ref awards a free kick. Frank Lampard has an effort direct from the free kick,
save by Chris Kirkland.
5:40 The official flags Jason Scotland offside. John Terry takes the indirect free kick.
4:37 Effort from the edge of the box by Nicolas Anelka goes wide of the left-hand post.
3:19 Nicolas Anelka takes a shot. Blocked by Emmerson Boyce.
2:46 Hugo Rodallega gives away a free kick for an unfair challenge on Ashley Cole. Free kick taken by Ashley Cole.
2:27 Hugo Rodallega takes a shot. Save made by Petr Cech.
0:49 Foul by Titus Bramble on Nicolas Anelka, free kick awarded. Direct free kick taken by Nicolas Anelka. Michael Essien takes
a shot. Chris Kirkland makes a save. Inswinging corner taken by Florent Malouda from the right by-line played to the near
post, Titus Bramble makes a clearance.
0:00 The game kicks-off.
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