Sunderland 2-1 Chelsea (after extra-time)
Substitute Ki Sung-Yueng sent Sunderland into the Capital One Cup semi-finals with a 118th-minute winner against Chelsea at the Stadium of Light.
Goal-line technology appeared to have won the game for the Blues in the 46th minute when Lee Cattermole inadvertently scrambled the ball over his own line under pressure from Frank Lampard.
But with two minutes of normal time left, Fabio Borini hit home an equaliser to send the tie into extra-time.
Then with two minutes of extra-time remaining, on-loan Ki—who won the trophy with Swansea City last season—placed the winner beyond Mark Schwarzer with his first goal for the Wearsiders.
Andre Schurrle had the first shot on target in the fourth minute, but Sunderland goalkeeper Vito Mannone was behind the ball all the way.
Willian was next to test Mannone, but his shot was also comfortably held by the Black Cats' goalkeeper.
Sunderland were also offering some threat, notably down the left flank through Emanuele Giaccherini.
Referee Anthony Taylor gave Kevin De Bruyne a warning for a poor challenge on the Black Cats winger in the 12th minute but held back on a yellow card.
Willian played Schurrle into the channel on the right side of the Sunderland area, where the German showed good control but could only fire across Mannone's goal.
Cesar Azpilicueta reacted swiftly to snuff out the danger from John O'Shea from a Seb Larsson free-kick into the box in the 20th minute.
Samuel Eto'o let fly a minute later with a powerful drive from outside the area, but the effort was blocked and cleared.
In the 25th minute, David Luiz earned an unnecessary first caution of the game for deliberately blocking a Giaccherini run.
Luiz was required to act quickly a minute later as Jozy Altidore threatened to break clear, but the Brazilian cleared well.
Andrea Dossena picked up a caution for blocking a Willian run after his clever interplay with De Bruyne threatened down the right.
Sunderland supporters were calling for a penalty in the 32nd minute when Azpilicueta appeared to handle a Dossena cross, but television replays were inconclusive.
Willian was looking lively when he got the ball and he fired wide in the 36th minute after being found by a Lampard ball.
Wes Brown was guilty of losing possession to Azpilicueta moments later and was fortunate not to concede a free-kick on the edge of the area for a push on Willian as he attempted to retrieve the ball.
Ashley Cole was helped by goalkeeper Mark Schwarzer when his header back fell short and the former Fulham No. 1 was alert to the danger.
It took less than a minute of the second period for Chelsea to open the scoring, with the help of goal-line technology.
Azpilicueta raced down the right wing before delivering a great low cross into the six-yard area. Lampard chased in with Lee Cattermole and the new goal-line technology helped referee Taylor correctly award the goal.
However, while the technology helped Chelsea to open the scoring, it could not decipher who had scored and the goal was eventually credited as a Cattermole own goal.
A misplaced Craig Gardner pass gave Eto'o the chance to double Chelsea's lead, but the striker placed the ball wide when he should have done better.
There was a more ruthless edge to Chelsea in the second half, De Bruyne flashing a shot wide with Mannone flailing.
Sunderland manager Gus Poyet switched Gardner for Ki in the 62nd minute and the Black Cats almost grabbed an immediate equaliser, but Johnson ballooned his shot wide and over.
A topless male streaker interrupted the match in the 65th minute, much to the amusement of Poyet and Mourinho on the sidelines.
Azpilicueta was forced out of the match in the 70th minute after picking up a knee injury and was replaced by Michael Essien.
And Poyet made another change when he swapped Johnson for on-loan Liverpool striker Fabio Borrini, after Demba Ba had come on for Chelsea.
In the 78th minute, Schurrle produced a fine save from Mannone with a rasping drive which the Sunderland goalkeeper pushed away.
A long Luiz free-kick into the area was caught by Ba, but his effort drifted wide of the Sunderland goal.
Eden Hazard replaced Schurrle with seven minutes left as Mourinho chased a second goal to kill off the spectre of extra-time.
With two minutes left, though, Sunderland stunned the Blues with a late equaliser.
Altidore collected the ball in the area and attempted to open up space for himself, but the ball was cleared wide to sub Borini, who fired home from an angle.
Borini almost added a second when he chased into the area, but a tremendous Cahill block denied the striker.
Brown did well to clear a Willian cross for a corner and Luiz failed to connect fully with a strike at goal from the resulting set-piece.
The former Manchester United defender was again central for Sunderland when he denied Ba with a brilliant clearance from a Willian ball.
Cole was almost at fault for Chelsea 10 minutes into extra-time when he misjudged a cross and allowed Borini to steal in at the back. However, the striker was also fooled by the ball and missed the target.
Essien made a point-blank block from Altidore after Schwarzer had punched away an excellent Larsson free-kick which flew through a crowd of players.
Schwarzer then produced a superb save to palm away a perfect Ki header from Larsson's floated free-kick into the area.
Then with two minutes of extra-time remaining, Sunderland grabbed the lead. Borini collected the ball in the area and played it to Ki, who opened up space for himself before beating Schwarzer with a placed strike.
Samuel Eto'o B
The Chelsea striker might not be the player he once was, but his return from a hamstring injury was undermined by a lack of service in the first half.
Should have doubled the Blues' lead early in the second period but shot wide.
Looked off the pace in the second period as his time out caught up with him and he was replaced by Demba Ba.
Frank Lampard A
Finally appeared to have gained some revenge for his disallowed goal in the 2010 World Cup finals vs. Germany when his 46th-minute opener was awarded by goal-line technology.
But the disappointment continued for the England international when the strike was later awarded as a Cattermole own goal.
Showed composure and experience throughout for Chelsea, bar a wayward effort from distance in the 59th minute which troubled only Row Z.
Jozy Altidore B
Worked hard for Sunderland but, like Eto'o, lacked service to provide a cutting edge in the final third.
Played his part in Borini's late equaliser, despite being unable to find space for himself to become the Sunderland hero.
Denied a late winner by a block from Chelsea substitute Michael Essien.
Ki and Cattermole were both superb there.— Jonathan Wilson (@jonawils) December 17, 2013