the BIG one
Red faced or mon
blues come early hours mon morning?:p
BIG-MATCH FACTS
This eagerly awaited heavyweight clash at Old Trafford could be a defining match in the title race, as both clubs bid to make up ground on leaders Liverpool.
Chelsea go into the weekend three points behind the Merseysiders; Manchester United are seven points off the pace, and four points behind the Blues with two games in hand on both.
The top home club faces the top away club, going into this round of top division fixtures. United are unbeaten at Old Trafford; Chelsea unbeaten on the road so far in this Premier League campaign.
Chelsea are the first of the 'Big Four' clubs to visit Old Trafford this season; United have drawn one (at Chelsea) and lost two (v Arsenal and Liverpool).
The Red Devils are the first of the 'Big Four' Chelsea have faced away from home; Scolari's side have already lost to Liverpool and Arsenal at Stamford Bridge.
The last time Chelsea turned up at Old Trafford for a Premier League match, Jose Mourinho had just left the club, and Avram Grant took charge for the first time. The Blues lost 2-0.
Defeat for the home club will be their 150th league loss under Sir Alex Ferguson, and 300th home defeat in top-flight football; defeat for the Blues will be their 100th Premier League loss away from home.
Chelsea had to rely on a headed goal from Salomon Kalou 10 minutes from time to salvage a point from a pulsating reverse fixture in September. Park Ji-sung had given United the lead in the 1-1 draw.
Manchester United have conceded more goals (43) and dropped more points (58) to Chelsea than to any other club in the Premier League.
The Red Devils were the last club to beat Chelsea in a Premier League game by more than a single goal (23 September 2007); Chelsea were the last club to beat United by more than a single goal (29 April 2006).
Distance between the clubs: 204 miles (328 kilometres)
CLUB FORM
MANCHESTER UNITED
Club stats
Going into the weekend: 3rd 38 points
Best & Worst categories in 2008-09 Premier League
(all statistics are ahead of this weekend's round of Premier League fixtures)
1. Wednesday's surprise 1-0 away loss to Championship Derby in the first leg of the Carling Cup semi-final ended a five match winning run, and 14-game undefeated sequence in all competitions.
2. Unbeaten in seven Premier League matches; won five and drawn two since losing to Arsenal 2-1 at the Emirates Stadium on 8 November; their only loss in 15 league outings.
3. Not conceded in seven or 672 minutes (11 hours 12 minutes) of Premier League football since Samir Nasri scored Arsenal's second in their odd goal in three home victory two months ago.
4. Won the last seven home league games, conceding in just one of those seven victories (4-3 v Hull on 1 November).
5. Undefeated in 13 top-flight matches at the Theatre of Dreams; won 12 and drawn one (v Newcastle) since losing 1-2 against Manchester City on 10 February - their only defeat in 27 at home.
6. Won the last six home top-flight matches against London clubs, and lost one of 10 (against West Ham).
7. Won 50 of 60 Premier League matches at Old Trafford.
8. Not beaten a fellow 'Big Four' club, since the 2-1 home victory over Arsenal on 13 April.
9. Four points down on this same stage last season.
Fixtures
CHELSEA
Club stats
Going into the weekend: 2nd 42 points
Best & Worst categories in 2008-09 Premier League
(all statistics are ahead of this weekend's round of Premier League fixtures)
1. Undefeated in seven in all competitions.
2. Unbeaten in five Premier League games; won two and drawn since their only defeat in 11; 1-2, home to Arsenal on 30 November, when last top of the table.
3. Won 16 and drawn four of the last 20 away top-flight fixtures, since losing 1-0 to Arsenal at the Emirates on 17 December 2007.
4. Won their first eight league games on the road this season, and drawn the most recent two.
5. The 2-2 draw at Fulham on 28 December were the first goals conceded in eight games away from home.
6. Not lost in the North-West since last season's visit to Old Trafford.
7. One point up on the equivalent juncture last season, but seven and 17 points down on the corresponding stage in their title-winning seasons.
Fixtures
KEY PLAYER NOTES
MANCHESTER UNITED
Squad profiles
Cristiano RONALDO is yet to score a Premier League goal against Chelsea.
Edwin VAN DER SAR is leading the race for the Barclays Golden Glove, along with Jose REINA of Liverpool and Chelsea's Petr CECH. All three have kept 11 clean sheets, ahead of this current round of fixtures.
If selected:-
Rio FERDINAND will be making his 200th Premier League appearance for Manchester United.
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CHELSEA
Squad profiles
Kose BOSINGWA and Frank LAMPARD are the only remaining players to have started all of Chelsea's Premier League matches this season.
Nicolas ANELKA is the top-scoring Premier League player with 16 club goals in all competitions, and is leading the race for the Barclays Golden Boot with 14 Premier League goals.
Petr CECH is level with Liverpool's Jose REINA and Manchester United's Edwin VAN DER SAR, in the race for the Barclays Golden Glove. All three have kept 11 clean sheets (going into this weekend's fixtures).
HEAD TO HEAD
Chelsea's only win in six Premier League matches at the Theatre of Dreams was 1-3 on 10 May 2005 when Tiago, Eidur Gudjohnsen and Joe Cole got on the score sheet.
Discounting the penalty shoot-out loss in last season's Community Shield, Chelsea have only lost two of their last 15 competitive games against Manchester United.
Home and away
League (inc PL): Man United 55 wins, Chelsea 37, Draws 41
Prem: Man United 9 wins, Chelsea 10, Draws 14
at Man United only
League (inc PL): Man United 26 wins, Chelsea 17, Draws 23
Prem: Man United 5 wins, Chelsea 4, Draws 7
LAST SEASON'S CORRESPONDING GAME
Manchester United 2-0 Chelsea
23 September 2007 - Ref: Mike Dean
Man Utd scorers: Tevez 45, Saha 90 (pen)
Sent Off: Obi (Chelsea) 32
THIS SEASON'S REVERSE FIXTURE
Chelsea 1-1 Manchester United
21 September 2008 - Ref: Mike Riley
Chelsea scorer: Kalou 80
Man Utd scorer: Park 18
REFEREE
Howard Webb (Yorkshire)