All the action from Indianapolis.
1 M Schumacher (Ferrari)
2 R Barrichello (Ferrari)
3 T Sato (BAR)
4 J Trulli (Renault)
5 O Panis (Toyota)
6 K Raikkonen (McLaren)
7 D Coulthard (McLaren)
8 Z Baumgartner (Minardi)
Lap 73: Schumacher seals yet another victory ahead of Barrichello - his eighth win out of nine Grand Prixs this season. BAR's Takuma Sato clinches third - his first ever podium finish and he is overjoyed.
Jarno Trulli, who had to start from the back of the grid, can be satisfied with fourth while Olivier Panis celebrates his 150th race with fifth.
Meanwhile, Zsolt Baumgartner, who finishes eighth in the Minardi is the first ever driver from Hungary to pick up a Formula One point.
Lap 72: Michael Schumacher is moving seamlessly towards another Grand Prix victory with a lead of 3.6 seconds over Barrichello.
Lap 71: Olivier Panis could move to challenge Jarno Trulli for fourth but the Italian could have the measure of the Frenchman.
Lap 70: Only eight drivers are left on track.
Lap 69: Minardi's Zsolt Baumgartner overtakes Fisichella to move into the points and Fisichella retires later in the lap.
Lap 67: Fisichella is struggling with a hydraulics problem and his race could shortly be at an end.
Lap 66: Michael Schumacher continues his march to the finish with another win looking increasingly likely with a lead of over two seconds.
Lap 63: Takuma Sato makes an unscheduled pit stop but he is now 21 seconds behind the top two.
Lap 61: Trulli is now under pressure from Takuma Sato as Mark Webber is the latest retirement.
Lap 60: Jarno Trulli is 14 seconds behind and could pick up points for third, barring any more problems.
Lap 59: Michael Schumacher still maintains his lead ahead of Barrichello.
Lap 58: Montoya is disqualified from the race after being given a black flag for a technical infringement relating to the incident in the start where he used the spare car.
Lap 57: Montoya pits at the end of the lap.
Lap 56: Juan Pablo Montoya is closing the gap but he will need to pit again.
Lap 54: The battle between Trulli and Sato for fourth place is also keenly contested with only three and a half seconds between them.
Lap 53:The gap between the pair is around fourth tenths of a second and Barrichello could have the advantage of his later pit stop.
Lap 52: The pair almost come together for a second time on the fifth corner. Down the field, Mark Webber pits while David Coulthard is overtaken by Kimi Raikkonen.
Lap 51: The two Ferraris are fighting out a great battle but Schumacher remains narrowly ahead.
Lap 50: Schumacher is narrowly ahead of Barrichello, who has been in great form at the track this week and Schumacher is forced to defend his corner.
Lap 49: Fischella in the Sauber loses a tyre and has to pit while Barrichello makes his pit stop but loses first place to Schumacher.
Lap 47: Michael Schumacher is about 20 seconds behind Barrichello and that may not be enough for the Brazilian, who is still due to make another stop.
Lap 46: Jarno Trulli pits, allowing Michael Schumacher move into second place and Trulli rejoins in fifth.
Lap 45: Nick Heidfeld is forced out in the Jordan, leaving 11 runners while Sato comes in from fourth for his pitstop.
Lap 44: Barrichello maintains his advantage over Trulli at the top of the field.
Lap 43: Rubens Barrichello takes the lead momentarily thanks to Schumacher's pit stop but the fastest man on the track is Takuma Sato. Schumacher goes ino third.
Lap 42: Michael Schumacher comes in at the end of the lap for another pit stop with a comfortable lead.
Lap 41: There is no change among the top three with Schumacher leading by 15 seconds. But Juan Pablo Montoya in 6th is under investigation from the stewards.
Lap 40: Takuma Sato gets past Olivier Panis into fourth while David Coulthard gets into the points.
Lap 39: Jarno Trulli in third continues what is a good race for him, after starting from the back.
Lap 38: Raikkonen looks to be struggling and his race could shortly be at an end.
Lap 37: Michael Schumacher now holds a comfortable 13 seconds lead over teammate Rubens Barrichello.
Lap 36: Montoya rejoins in sixth place after his pit-stop.
Lap 35 Montoya in the spare Williams and Kimi Raikkonen, who seems to be having a problem with his electronics, both pit at the end of the lap.
Lap 34: Michael Schumacher maintains a lead of around seven seconds but Montoya is trying to chip away at the advantage.
Lap 33: Takuma Sato in sixth is the fastest man on the track and is lapping sixth tenths of a second faster than the leader Michael Schumacher.
Lap 32: Trulli puts in a very past first sector from fourth but the order stays the same.
Lap 31: As Michael Schumacher heads affairs, he holds a comfortable seven second lead over Montoya, with Barrichello a further five seconds back.
Lap 30: Kimi Raikkonen pits from third place and allows Sato to move further up the field into sixth.
Lap 29: Takuma Sato is finding it difficult to get past Jordan's Nick Heidfeld into eighth.
Lap 27: Jensen Button is forced to retire with what looks like an engine problem, ending his hopes of a points finish.
Lap 26: Sato gets past David Coulthard to move into ninth place with Button now in 11th.
Lap 25: Takuma Sato also pits at the end of the lap and he also drops down the field.
Lap 24: Jensen Button comes in from third to pit at the end of the lap but he does not come smoothly into the pit, losing a bit of time.
Lap 23: Sato moves to challenge Schumacher but the world champion is too good.
Lap 22: The gap between Schumacher and Sato drops down to 0.5 seconds and Sato is hoping to make his smaller fuel load count.
Lap 21: Schumacher maintains his advantage by 0.8 seconds and he is looking relatively comfortable.
Lap 20: Michael Schumacher is in control of the race. Significantly, the three cars behind him, Sato, Button and Montoya, did not stop while the safety car was out.
Lap 19: The safety car is coming in at the end of this lap with only 13 cars left in the race.
Lap 18: Cristiano da Matta suffers more trouble and drops down the field and is forced out.
Lap 17: Jaguar's Mark Webber decides to pit from fourth place and rejoins at the back in 14th place.
Lap 16: As Ralf Schumacher is brought away by ambulance, the drivers are still racing behind the safety car.
Lap 15: Ralf Schumacher is finally put into the ambulance on a stretcher. He is wearing a neck brace and a support to both sides of his body.
Lap 14: The safety car guides the cars around and they go by Ralf Schumacher's accident at a crawl with the German still receiving medical attention.
Lap 13: The drivers are still on their way around behind the safety car.
Lap 12: An ambulance is in attendance for Ralf Schumacher but it is not yet clear about the extent of his injuries. Rubens Barrichello makes a poor pit stop and he drops down the field to seventh.
Lap 11With the safety car out, both Ferraris and both McLarens take the chance to pit. Ralf Schumacher is still stricken in his car on the track with debris causing problems for other drivers.
Lap 10: Ralf Schumacher is out of the race after losing control of his car around the 180mph last corner.
Lap eight: Fernando Alonso has a disastrous crash and goes out of the race with a rear tyre problem.
Lap seven: Michael Schumacher is leading the field but Alonso is losing time on the two Ferraris. Juan Pablo Montoya, who started from the pit lane, moves up to 12th with Trulli one place ahead from the back of the grid.
Lap six: The safety car comes in and Michael Schumacher passes Barrichello quickly just on the start/finish line to take the lead.
Lap five: Safety car is coming in at the end of this lap.
Lap three: The cars continue to make their way around the track behind the safety car.
Lap two:Alonso continues his good start in third behind the two Ferraris with the safety car still out. Cristiano Da Matta has already made one pitstop.
Lap one: A dramatic start as the safety car is deployed after a crash involving Klien, Massa, Pantano and Bruni.
Fernando Alonso makes the best start of all, moving well up the field from ninth to third.
1802: Michael Schumacher barges his way in front of Takuma Sato as Montoya, who had qualified fifth, is forced to start from the pit lane.
1800: Ferrari's Rubens Barrichello leads the drivers away on their formation lap at a hot Indianapolis Speedway but Juan Pablo Montoya's car is going nowhere and the driver rushes to get the spare car.
The forecast is for hot, dry weather as Ferrari drivers Rubens Barrichello and Michael Schumacher start from the front row at the Indianapolis Motor Speedway.
All the signs are that F1 is set for another afternoon of Ferrari domination - Schumacher has won six of the seven races so far, with Barrichello second five times.
But there is some speculation at Indianapolis that Ferrari may have gone for a lighter fuel load than their rivals in qualifying to ensure they qualified at the front and were not held up in the early laps of the race.
If that is the case, it may create some uncertainty as Schumacher and Barrichello try to make up enough of an advantage so as not to be held up after their first pit stops.
There is a hope that Ferrari may allow Barrichello to race Schumacher, but the more realistic view is that the German will end up ahead, either by team strategy or by his own driving talent.