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Brawn GP will almost certainly wrap up the Constructors’ Championship at the Brazilian Grand Prix in two weeks’ time but the Drivers’ Championship is still a three horse race.

Jenson Button has a 14 point lead over team mate Rubens Barrichello and a 16 point lead over Red Bull’s Sebastian Vettel.

There are 20 points available over the next two races, so it is still possible for Vettel to be crowned Champion but what will it take for Jenson to seal the Championship at Interlagos?

There are a few ways Button can clinch it:

1. He finishes third or better
2. He scores four points more than Barrichello
3. Vettel finishes lower than second and Barrichello finishes lower than fourth

As usual, Button remains positive:

We go to two circuits now which should suit our car so I’m excited about the end of the season and already looking forward to the next race in Brazil.

Of course if a track suits Jenson’s car it also suits Barrichello’s and the Brazilian will be on home territory fighting for probably his last shot at the Championship:

I’ve got to go there and win the race, that’s the aim. The rest, I don’t care about, and if I deserve to win the championship, I will.

It might be a long shot for him but Sebastian Vettel is not going to give up:

As I’ve said many times already, I will fight until the end, until the last breath.

The good news for fans is that all three drivers will really be fighting for the win in Brazil.  Barrichello and Vettel need it to keep their chances alive and Button can’t afford to lose many more points.

Image: Brawn GP

There was a chance both the Drivers’ and Constructors’ Championships might have been decided at Suzuka.  Instead, after a dramatic qualifying session and a race dominated by Sebastian Vettel, we leave Japan with both titles still up for grabs.

Many expected Brawn GP to seal the Constructors’ Championship this weekend and they came very close to doing so.  While Red Bull are still in with a chance (mathematically), Brawn only need half a point to seal victory, something they are almost certain to do in Brazil.

The Drivers’ Championship is a lot less certain, though.

Sebastian Vettel was untouchable around the demanding Suzuka circuit, starting from pole position and leading from lights to flag.

What a race! We already had pole position and strategy-wise we were the favourites, but, you know – first of all you have to do the start! We were pretty confident that we could defend our position, as we’ve had good starts in the past, but it was closer than I thought it would be! Going into Turn 1, I suddenly saw a silver arrow on my left-hand side, but I had the inside line so it was my advantage. After that I put my head down and tried to push with every single lap.

Lewis Hamilton was on target to claim second until a problem with KERS saw him fall into the clutches of Toyota’s Jarno Trulli.

When we were behind the Safety Car, I asked the team if they could get the KERS working again so that I could shoot past Jarno but they couldn’t do it and I wasn’t close enough to get in his slipstream at the restart.

In a weekend marked by a string of shunts, rookie Jaime Alguersuari crashed spectacularly through a trackside sign to bring out the safety car on lap 43.  Rosberg pitted under the safety car and went on to finish 5th behind Kimi Raikkonen.

Barrichello and Button picked up the final two points-paying positions behind Nick Heidfeld.

Button now goes into Brazil 14 points ahead of Barrichello and 16 points ahead of Vettel.  In 2007 Kimi Raikkonen was 17 points behind Lewis Hamilton with two races to go and he ended up winning the Championship.

2009 Japanese Grand Prix Race Results

Image: Red Bull

The FIA now publishes the weights of each car after qualifying on Saturday. Those cars that make it through to the final qualifying session must use the fuel they qualified with while the rest of the field may refuel before the race.

Below is a graph showing the actual top ten qualifying times as well as those times adjusted for the weight of fuel each car is carrying. The graph assumes a standard lap time cost of 0.3 seconds per 10kg of fuel.

From these weights we can see that Adrian Sutil is running a little lighter than the other top 10 qualifiers and will have to make sure he has a good start to keep in front of Barrichello.

Everyone else seems to be roughly in position but Vettel’s blistering pace is clearly evident.  Jarno Trulli may be starting on the front row of the grid but unless Vettel makes a mistake it is unlikely Toyota will score their first win on Sunday.

2009 Japanese Grand Prix Car Weights

Image: Red Bull

The FIA now publishes the weights of each car after qualifying on Saturday. Those cars that make it through to the final qualifying session must use the fuel they qualified with while the rest of the field may refuel before the race.

Below is a graph showing the actual top ten qualifying times as well as those times adjusted for the weight of fuel each car is carrying. The graph assumes a standard lap time cost of 0.3 seconds per 10kg of fuel.

From these weights we can see that while nobody is really out of place when adjusted for fuel, Lewis Hamilton is quite a bit faster that his nearest rival Sebastian Vettel.  Starting from pole with KERS power Hamilton has every chance of taking the win.

Rosberg’s best qualifying this season was done on merit as well and fuel adjusted he was faster than Vettel in front of him.

2009 Singapore Grand Prix Car Weights

Image: Williams

The FIA now publishes the weights of each car after qualifying on Saturday. Those cars that make it through to the final qualifying session must use the fuel they qualified with while the rest of the field may refuel before the race.

Below is a graph showing the actual top ten qualifying times as well as those times adjusted for the weight of fuel each car is carrying. The graph assumes a standard lap time cost of 0.3 seconds per 10kg of fuel.

From these weights we can see that, while they may be on the third row, the two Brawns look quick.  They will be one-stopping and Hamilton will have to really fly off the start to prevent being jumped in his second stop.

Interestingly, the two McLarens seem to be on different strategies.  Kovalainen looks to be one-stopping and, adjusted for fuel, he was the fastest man in qualifying.  Starting on the second row, a podium or even a win looks a real possibility for Heikki on Sunday.

2009 Italian Grand Prix car weights

Image: McLaren