1 M Schumacher (Ferrari)
2 F Massa (Ferrari)
3 G Fisichella (Renault)
4 J Trulli (Toyota)
5 F Alonso (Renault)
6 R Barrichello (Honda)
7 D Coulthard (Red Bull)
8 V Liuzzi (Toro Rosso)
Latest updates (all times BST):
Lap 73: Michael Schumacher closes the gap on points leader Fernando Alonso by winning the US Grand Prix in Indianapolis for the fifth time in seven years. Ferrari team-mate Felipe Massa takes second, while Giancarlo Fisichella completes the podium in a race, where just nine cars finished. Sunday's showdown started in dramatic style with seven cars at the back of the grid crashing out in a pile-up on lap one.
Lap 70: Schumacher looks set to break Alonso's run of four consecutive wins as he cruises along with 14+ second lead over Ferrari team-mate Massa. Renault's Fisichella has done well to stay in podium position a further 11 seconds behind, while Trulli has enjoyed a tremendous drive moving up to fourth after starting the race in the pit lane.
Lap 64: Ralf has retired after a wheel bearing failure on his Toyota, allowing Liuzzi to move up to eighth and set for his points of the season, while Coulthard is seventh.
Lap 63: Ralf Schumacher is pulling in for his third pit-stop which does not bode well for Toyota. If he retires, that leaves just nine cars in the race.
Lap 57: Six of the top eight drivers have now pitted twice, while the remaining two - Trulli in fourth and Coulthard in eighth - are on one-stop strategies. Another fastest lap for leader Schumacher, who clocks 1:12.719.
Lap 54: Schumacher pits from the lead and Fisichella's also in and will be hoping to get out ahead of Trulli, who's been enjoying a fantastic drive.
Lap 52: The Ferrari mechanics are getting ready in the pit lane and it's Massa, who is first of the two cars to come in.
Lap 51: Schumacher sets the fastest lap of the race so far with 1:12.954.
Lap 49: Coulthard makes his first stop and just manages to come out ahead of Liuzzi and Rosberg to stay in eighth.
Lap 44: Rosberg makes his first stop to fall out of the points positions as Coulthard moves up to eighth. Further up the running order, Alonso is finding it hard to shake off the challenge of Ralf Schumacher's Toyota. Ralf is just over a second behind the reigning world champion. Christijan Albers has been pitted for a long time and now has been listed as retired.
Lap 39: Trulli finally pits in after making his way up to third following his start from the pit lane. Meanwhile race leader Schumacher has opened up an almost four-second gap over Ferrari team-mate Massa. Christijan Albers has been pitted for a long time
Lap 35: Jarno Trulli appears to be on a one-stop strategy as he chases the leading Ferraris but has yet to come in for a pitstop.
Lap 31 Massa emerges from the pit lane unsurprisingly behind Ferrari team-mate Schumacher, who now leads the US Grand Prix.
Lap 29: Schumacher and Fisichella both come in for their first pit stop. Race-leader Massa has clocked the fastest lap of the race so far with one minute 12.954 seconds.
Lap 24: Vitantonio Liuzzi is making the most of his new engine to put pressure on 10th-placed David Coulthard. But it's all over for Jacques Villeneuve, who has stopped by the side of the track and is walking away form his Toyota. It leaves Nico Rosberg is a points position, having started the race in 21st. Rubens Barrichello is first to pit.
Lap 20: Massa still leads with a 1.3-second gap over Ferrari team-mate Schumacher, while Renault's Fisichella is a further 9.4 seconds behind.
Lap 14: Fisichella finally manages to get past his slower team-mate, Alonso, who appears to let him through at turn one. It also seems that Jarno Trulli's luck has changed after starting in the pit lane following his car's failure in qualifying. The Italian managed to miss the mass pile-up on lap one and is now up to eighth in his Toro Rosso.
Lap 11: Second-placed Schumacher is more than five seconds ahead of Alonso, who appears to be forming a train of cars behind and is clearly holding up team-mate Fisichella. Tiago Monteiro's Midland becomes the ninth car to retire after his earlier contact with Sato's Super Aguri.
Lap 8: Giancarlo Fisichella remains in fourth but is really challenging Renault team-mate Alonso. The Ferrari cars still lead the way though, over a second ahead of the Renaults.
Lap 7: The drama continues at the Indianapolis Motor Speedway as Tiago Monteiro collects Takuma Sato, who spins out of control.
Lap 6: The safety car peels off at the end of the lap as racing resumes after a highly dramatic start to the US Grand Prix.
Lap 5: Jenson Button has retired from the race with engine on his Honda smoking - obviously still smarting from the pile-up on turn one.
Lap 1: It's all drama on the first lap as Felipe Massa sneaks inside Ferrari team-mate and pole-sitter Michael Schumacher on the first turn to take the lead. World champion Fernando Alonso has already moved up too into third after starting fifth. But it's calamity further down the order as seven cars are involved in a pile-up on turn one. Kimi Raikkonen, Nick Heidfeld, Juan Pablo Montoya, Scott Speed, Christian Klien and Franck Montagny are all out. On the replays of the incident, it appears that Montoya went into the back of McLaren team-mate Raikkonen, who pushed wide into Button, who then sent Heidfeld into a double roll while also catching American hope Speed.
1800: The parade lap is under way. The track temperature is 41C and rising. Vitantonio Liuzzi, who qualified 19th, starts 20th after being penalised for an engine change on his Toro Rosso, while Nico Rosberg is 21st for failing to visit the weighbridge during qualifying.
1751: The teams are making their final preparations and the drivers are putting on their helmets as just nine minutes remain before the start of the race.
1745: It's a blistering hot day with the air temperature rising to 36C and a humidity level of 40% with many of the drivers looking hot and sweaty before the race has even begun.
1730: The pit lane opens and the cars begin to leave to form up on the dummy grid.
1725: Formula One is certainly not short of fans among the rich and famous. So it's no surprise to see English actor Hugh Laurie pottering around the paddock. The star of hit TV series House and children's movie Stuart Little looks excited but a bit bewildered by the whole experience.
1706: With 54 minutes to go, the sun is beating down on scorching day at the Indianapolis Motor Speedway, which boasts a blistering air temperature of 34C. The news from the track is that Jarno Trulli will start the race from the pit lane as Toyota changed a suspension component overnight.
World championship leader Fernando Alonso faces a frustrating afternoon of damage limitation at the United States Grand Prix on Sunday.
The Renault driver qualified only fifth on the grid, with his title rival Michael Schumacher on pole position in his Ferrari.
Schumacher was more than a second faster than the next non-Ferrari driver in qualifying, and more than 1.5 seconds faster than Alonso.
Those time differences indicate more than just the varying fuel loads the drivers may have chosen to start the race - they appear to show that Ferrari's Bridgestone tyres appear to have a huge advantage over the Michelins used by Renault and several other leading teams.
It is understood that Michelin have been cautious in their tyre selection for this year's race at Indianapolis.
That decision was made to ensure there was no repeat of last year's fiasco when only six cars started the race because Michelin could not guarantee the safety of its tyres.
The decision of the Michelin teams to pull out last year angered fans and has put the future of the US Grand Prix in jeopardy.
As a result, F1 has been on a charm offensive this weekend in an attempt to repair its battered image.
But that seems unlikely to extend to a competitive Grand Prix.