It's all over and Manchester United take the points. It wasn't quite as easy as the scoreline suggests, but a deserved victory for the Champions.
90
It looked a slightly harsh penalty it has to be said - will be interesting to see that again.
90
Goal
Penalty for Manchester United - Ronaldo puts it away to finish the game off in style.
90
Three minutes of added time have been announced.
89
Everyone is looking tired now, with these horrible conditions getting the better of the players. Both sides will be happy to here the full time whistle.
87
From the freek kick, the always involved Ronaldo comes close, his strike just misses the target.
87
Ronaldo gets past Darren Moore but the Derby defender fouls the Portugal international as he attempts to win the ball back.
85
As the game begins to die down, Derby will be looking ahead to their next game - a crucail game against Middlesbrough.
82
Paul Jewell's men have finished this game as they started it - the better side! It's the periods in between that have cost them.
80
The visitors break away again with a chance falling to Howard before O'Shea clears the danger.
78
Derby now need to find a second quickly if they are to have a chance - maybe Manchester United relaxed too much.
75
Goal
Derby County score their first away goal of the year as Howard bundles the ball home.
75
It's Rooney's 100th league start for Manchester United today - can he mark it with a goal? He's running out of time as we approach the last quarter.
72
Substitution
Rio Ferdinand is replaced by John O'Shea as Manchester United make their third change.
72
Gary Teale almost scores an own goal as his back pass to Bywater goes past the keeper and goes behind for the corner.
70
Dipping shot from Rooney goes just over the bar - he seems desperate for a goal today and you wouldn't bet against him at this stage.
69
Saha has looked lively since coming on, it appears to be damage limitation for Paul Jewell now.
68
After that latest piece of action involving the Derby keeper, it seems appropriate to mention that Bywater is the only player to play every minute so far for Derby this season.
66
Chance for Saha straight away but Bywater smothers the ball and prevents the Frenchman making it 4-0.
64
Substitution
Another substitution for the home side, Louis Saha replaces the man who opened the scoring today - Ryan Giggs.
63
Substitution
Gary Teale replaces the young Giles Barnes for Derby County
62
Substitution
Darren Fletcher replaces Anderson with the game all but one for Alex Ferguson's men.
60
Goal
Tevez makes it 3-0 to Manchester United - that must be all over now, great strike.
59
Giggs hit the post as the game becomes streched, Miller has a chance straight away for Derby but he fires over the bar.
58
A Derby break away results in Pearson producing a poor cross which misses Howard who was waiting in the middle.
55
Shot form Barnes from 25 yards out looks harmless, but the ball pops up and Van de sar has to scramble the ball away for a corner.
53
Shot from Ronaldo strikes the wall - he'll be annoyed with himself after that effort.
52
Yellow Card
Andy Griffin is booked after a foul on the danger man Ronaldo, free kick now in a dangerous position.
51
Luis de Abreu Anderson breaks for Manchester United in their search for the third goal of the game before Claude Davis clears the danger.
49
Substitution
Criag Fagan is replaced by Tyrone Mears in a double change from Paul Jewell.
48
Substitution
Jay McEveley is replaced by Steven Howard for the visitors.
48
Derby will need to find their first away goal of the season if they are to have a hope in this game, they must score the next goal.
45
Kickoff
The second half is underway with the Champions in complete control. Can Derby get themselves back into it? The next goal will be crucial.
Half time
Its's half time now and two goals in five minutes have put the home side in command against bottom of the table Derby County.
45
Goal
Tevez strikes home from eight yards after a ball from Ronaldo - game over?
44
Derby will want half time now, they can't afford to go 2-0 down at this stage.
43
Fantastic chance for Rooney to make it 2-0 as he rounds Stephen Bywater before hitting the bar with his effort. He did everything well other than the finish!
42
It has to be said that goal was coming, despite Derby's endeavour they were unable to get themselves th half time level.
41
Goal
Ryan Giggs scores his 100th league goal to give the home side the lead after relentless pressure.
40
Pressure again from Manchester United but no clear cut chance, important clearance yet again from McEveley.
39
Ronaldo has been given a free role now as the home side are clearly frustrated by Derby's resistance.
37
Good run from Barnes results in a lofty strike from Stephen Pearson which goes comfortably over the bar.
35
Remember Derby held on against Sunderland in Jewell's first game in charge last week until the last minute. They will look to hold on that little bit longer today.
32
Yellow Card
Claude Davis is booked after a foul on Rooney - free kick to Manchester United.
30
Ronaldo gives the ball away as a Manchester United attack breaks down, Derby have weathered the storm of the last few minutes and will be delighted with the first 30 minutes.
28
A free kick from 35 yards is taken by Ronaldo and despite the vicious dip - it goes over the bar.
28
A free kick from 35 yards is taken by Ronaldo and despite the vicious dip - it goes over the bar.
26
Just to note - Owen Hargreaves was injured in the warm up leading to today's game with Michael Carrick taking his place in the starting eleven.
24
Derby are under pressure now, with McEveley making a fantastic clearance to prevent the opening goal of the game.
21
The last time Derby County visited Old Trafford back in 2001, it resulted in a 5-0 win for the home side. Alex Ferguson will be hoping for more of the same today.
19
As we approach the 20 minute mark, Paul Jewell will be very happy with his side - they have defended well in the opening periods.
17
Manchester United are beginning to get going now, a deflected Rooney shot results in another corner.
15
Cristiano Ronaldo has his first run of the game for the home side, resulting in a free kick which Giggs strikes just over the bar - good effort.
13
Low shot from Jay McEveley tests Edwin Van der Sar as the away side continue to pile on the pressure.
11
Ryan Giggs comes into todays game looking for his 100th career league goal.
9
Derby have had the majority of possession so far. As Barnes' free kick causes problems for Patrice Evra who eventually clears.
7
It's Paul Jewell's second game in charge of Derby County today - can he pull of an amazing victory? They have started positively enough.
5
Two corners in quick succession for Derby taken by Giles Barnes as they look for their first away goal of the season.
3
Manchester United on the attack straight away with Wayne Rooney playing through to Carlos Tevez who strayed offside.
2
Very wet in Manchester today, will be interesting to see how it effects the game.
Kickoff
They are under way at Old Trafford with Derby County looking to avoid their sixth defeat on the bounce against Champions Manchester United.
Manchester United
Derby County
Full time
It's all over and Manchester United take the points. It wasn't quite as easy as the scoreline suggests, but a deserved victory for the Champions.
It looked a slightly harsh penalty it has to be said - will be interesting to see that again.
Goal
Penalty for Manchester United - Ronaldo puts it away to finish the game off in style.
Three minutes of added time have been announced.
Everyone is looking tired now, with these horrible conditions getting the better of the players. Both sides will be happy to here the full time whistle.
From the freek kick, the always involved Ronaldo comes close, his strike just misses the target.
Ronaldo gets past Darren Moore but the Derby defender fouls the Portugal international as he attempts to win the ball back.
As the game begins to die down, Derby will be looking ahead to their next game - a crucail game against Middlesbrough.
Paul Jewell's men have finished this game as they started it - the better side! It's the periods in between that have cost them.
The visitors break away again with a chance falling to Howard before O'Shea clears the danger.
Derby now need to find a second quickly if they are to have a chance - maybe Manchester United relaxed too much.
Goal
Derby County score their first away goal of the year as Howard bundles the ball home.
It's Rooney's 100th league start for Manchester United today - can he mark it with a goal? He's running out of time as we approach the last quarter.
Substitution
Rio Ferdinand is replaced by John O'Shea as Manchester United make their third change.
Gary Teale almost scores an own goal as his back pass to Bywater goes past the keeper and goes behind for the corner.
Dipping shot from Rooney goes just over the bar - he seems desperate for a goal today and you wouldn't bet against him at this stage.
Saha has looked lively since coming on, it appears to be damage limitation for Paul Jewell now.
After that latest piece of action involving the Derby keeper, it seems appropriate to mention that Bywater is the only player to play every minute so far for Derby this season.
Chance for Saha straight away but Bywater smothers the ball and prevents the Frenchman making it 4-0.
Substitution
Another substitution for the home side, Louis Saha replaces the man who opened the scoring today - Ryan Giggs.
Substitution
Gary Teale replaces the young Giles Barnes for Derby County
Substitution
Darren Fletcher replaces Anderson with the game all but one for Alex Ferguson's men.
Goal
Tevez makes it 3-0 to Manchester United - that must be all over now, great strike.
Giggs hit the post as the game becomes streched, Miller has a chance straight away for Derby but he fires over the bar.
A Derby break away results in Pearson producing a poor cross which misses Howard who was waiting in the middle.
Shot form Barnes from 25 yards out looks harmless, but the ball pops up and Van de sar has to scramble the ball away for a corner.
Shot from Ronaldo strikes the wall - he'll be annoyed with himself after that effort.
Yellow Card
Andy Griffin is booked after a foul on the danger man Ronaldo, free kick now in a dangerous position.
Luis de Abreu Anderson breaks for Manchester United in their search for the third goal of the game before Claude Davis clears the danger.
Substitution
Criag Fagan is replaced by Tyrone Mears in a double change from Paul Jewell.
Substitution
Jay McEveley is replaced by Steven Howard for the visitors.
Derby will need to find their first away goal of the season if they are to have a hope in this game, they must score the next goal.
Kickoff
The second half is underway with the Champions in complete control. Can Derby get themselves back into it? The next goal will be crucial.
Half time
Its's half time now and two goals in five minutes have put the home side in command against bottom of the table Derby County.
Goal
Tevez strikes home from eight yards after a ball from Ronaldo - game over?
Derby will want half time now, they can't afford to go 2-0 down at this stage.
Fantastic chance for Rooney to make it 2-0 as he rounds Stephen Bywater before hitting the bar with his effort. He did everything well other than the finish!
It has to be said that goal was coming, despite Derby's endeavour they were unable to get themselves th half time level.
Goal
Ryan Giggs scores his 100th league goal to give the home side the lead after relentless pressure.
Pressure again from Manchester United but no clear cut chance, important clearance yet again from McEveley.
Ronaldo has been given a free role now as the home side are clearly frustrated by Derby's resistance.
Good run from Barnes results in a lofty strike from Stephen Pearson which goes comfortably over the bar.
Remember Derby held on against Sunderland in Jewell's first game in charge last week until the last minute. They will look to hold on that little bit longer today.
Yellow Card
Claude Davis is booked after a foul on Rooney - free kick to Manchester United.
Ronaldo gives the ball away as a Manchester United attack breaks down, Derby have weathered the storm of the last few minutes and will be delighted with the first 30 minutes.
A free kick from 35 yards is taken by Ronaldo and despite the vicious dip - it goes over the bar.
A free kick from 35 yards is taken by Ronaldo and despite the vicious dip - it goes over the bar.
Just to note - Owen Hargreaves was injured in the warm up leading to today's game with Michael Carrick taking his place in the starting eleven.
Derby are under pressure now, with McEveley making a fantastic clearance to prevent the opening goal of the game.
The last time Derby County visited Old Trafford back in 2001, it resulted in a 5-0 win for the home side. Alex Ferguson will be hoping for more of the same today.
As we approach the 20 minute mark, Paul Jewell will be very happy with his side - they have defended well in the opening periods.
Manchester United are beginning to get going now, a deflected Rooney shot results in another corner.
Cristiano Ronaldo has his first run of the game for the home side, resulting in a free kick which Giggs strikes just over the bar - good effort.
Low shot from Jay McEveley tests Edwin Van der Sar as the away side continue to pile on the pressure.
Ryan Giggs comes into todays game looking for his 100th career league goal.
Derby have had the majority of possession so far. As Barnes' free kick causes problems for Patrice Evra who eventually clears.
It's Paul Jewell's second game in charge of Derby County today - can he pull of an amazing victory? They have started positively enough.
Two corners in quick succession for Derby taken by Giles Barnes as they look for their first away goal of the season.
Manchester United on the attack straight away with Wayne Rooney playing through to Carlos Tevez who strayed offside.
Very wet in Manchester today, will be interesting to see how it effects the game.
Kickoff
They are under way at Old Trafford with Derby County looking to avoid their sixth defeat on the bounce against Champions Manchester United.