Final positions after 71 laps:
1 JP Montoya (McLaren)
2 K Raikkonen (McLaren)
3 F Alonso (Renault)
4 M Schumacher (Ferrari)
5 G Fisichella (Renault)
6 R Barrichello (Ferrari)
7 J Button (BAR)
8 R Schumacher (Toyota)
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Lap 71: Juan Pablo Montoya comes home first, ahead of team-mate Kimi Raikkonen. But Fernando Alonso's third place finish is enough to see him crowned the youngest world champion in F1 history at the age of 24.
Lap 70: McLaren's mechanics get ready to celebrate a one-two finish but Renault's pit lane crew are poised to celebrate the world title for Fernando Alonso.
Lap 67: Montoya's lead grows to 1.5 seconds.
Lap 65: Aside from Ferrari's "success" at the ill-fated Indianapolis grand prix, no team has managed a 1-2 finish this season, but McLaren look on course to do it this time, with Montoya one second ahead of Raikkonen, and Alonso seemingly happy to stay in third place as that is all he needs.
Lap 63: Michael Schumacher seems safe in fourth place, but brother Ralf is closing in on seventh placed Button.
Lap 61: Raikkonen only trails Montoya by 0.6 seconds, with a gap of over 24 seconds to third placed Alonso. But third place is all the Renault driver needs to be crowned the youngest champion in Formula One history.
Lap 60: If the positions stay the same at the end of the race, McLaren will take over from Renault in the constructors' championship for the first time this season.
Lap 59: Leader Raikkonen makes his second pit stop, but as he races up the pit lane to get back onto the track, team-mate Montoya holds onto first place.
Lap 58: Monteiro is forced off with what looks like engine failure, dashing his dream of matching Michael Schumacher's record for successive completions.
Lap 56: Button and Ralf Schumacher make their second pit stop.
Lap 55: Michael Schumacher pits from fourth and holds his place.
Lap 53: Leader Montoya makes his second pit stop, when 0.5 seconds ahead of second placed Raikkonen, who has only made one stop so far.
Lap 49: Fisichella pits from fifth place, holding onto his place, ahead of Barrichello, who then pits himself, returning in ninth place.
Lap 49: Alonso pits from third and returns in fourth, allowing Michael Schumacher into third.
Lap 46: Slowly but surely, Montoya's lead continues to grow. The Colombian looks to be in with a good chance of victory in the only South American Grand Prix of the year.
Lap 44: Barrichello sneaks past Button up into sixth place, while leader Montoya's lead over team-mate Raikkonen goes up to three seconds.
Lap 39: Montoya stretches his lead to over two seconds. Button in sixth place is only 0.1 seconds ahead of Barrichello, who will be his BAR team-mate next season, and is competing in his home Grand Prix.
Lap 39: Raikkonen now trails leader Montoya by 1.5 seconds, with Alonso over 10 seconds behind the leader in third place.
Lap 38: Sato finally pits and returns in 10th place.
Lap 37: With Alonso comfortably in the position he needs to take the championship, there is no advantage to be gained for second placed Raikkonen by team-mate Montoya letting him through to take the lead, so it is likely there will be a proper battle between the leading pair to win the race.
Lap 36: Doornbos pits with smoke coming from the back of his car, and fire extinguishers are used, before he withdraws from the race. Leader Montoya is 2.1 seconds ahead of Raikkonen in second place.
Lap 34: Sato remains in sixth place, but he is the only one of the top 10 drivers who has yet to pit.
Lap 33: The closest battle on the track is between fourth placed Michael Schumacher and fifth placed Fisichella, with only 0.6 seconds dividing them. Alonso lies in third place, which will be enough to give him the world title.
Lap 31: Raikkonen pits from first place and returns to second place, behind Montoya.
Lap 29: Webber rejoins the race, 25 laps off the pace, in an effort to improve his qualifying position for the next Grand Prix.
Lap 28: Leader Montoya pits, taking 8.2 seconds.
Lap 26: Michael Schumacher and Button both pit. Montoya, who has yet to pit, remains over four seconds clear in first place.
Lap 24: Klien pits for fuel.
Lap 23: Fisichella and Barrichello both pit.
Lap 22: Alonso pits from second for a refuel and a small tyre adjustment, but he gets back out on track quickly, rejoining in sixth.
Lap 21: With little action at the front of the field, Albers pits from 12th place. Villeneuve passes Doornbos to go 12th.
Lap 19: Karthikeyan goes into the pits and rejoins in last place after a lengthy stop.
Lap 18: Massa pits from 10th place, the first driver to go into the pits. It is thought Raikkonen may go for a one-stop strategy.
Lap 16: Still no positional change up front, although the gap between second placed Alonso and third placed Raikkonen has grown to three seconds. The front four are two Renaults and two McLarens, which is important for the constructors' championship.
Lap 14: Trulli, who was penalised places on the grid for an engine change, continues to work his way up the field and is now in 12th place.
Lap 12: Still no positional changes, but Alonso starts to eat into Montoya's lead. Monteiro is the back marker of the race, but should he finish, he will equal Michael Schumacher's record for the highest number of successive finishes in GP.
Lap 10: Montoya slowly stretches his lead over Alonso to over four seconds, but there are no positional changes among the front runners. Klien in seventh place is falling away from Button in sixth.
Lap 8: Montoya's lead over Alonso is 3.2 seconds.
Lap 5: Alonso sets the fastest lap so far, and although he is still in second, he is opening up a gap over third placed rival Raikkonen.
Lap 4: Montoya leads Alonso by 2.3 seconds, with Raikkonen in third place and Fisichella in fourth.
Lap 2: The field are bunching behind leader Alonso and he suffers a wheel lock on turn one of the second lap, and is soon passed by Montoya.
Lap 1: Coulthard is involved in a collision with the Williams cars of Webber and Pizzonia before the first turn of the opening lap and the safety car is called out. Both Williams cars are out of the race before the first turn.
Webber's car returns to the pits and bursts into flames, but no-one seems to be injured as a result.
1800: The cars begin their warm-up lap.
1750: Light spitting rain starts to fall on the track. Track temperature is 23c and conditions are overcast.
1745: Kimi Raikkonen's team change the front left tyre on his car without penalty, despite drivers being supposed to compete on the same tyres they used for qualifying.
Raikkonen, who is starting from fifth, is the only driver who can deny pole sitter Fernando Alonso the world title, but any podium finish will see the Spaniard claim the title.