Lewis Hamilton can win his fifth world title if he finishes seventh or higher at this weekend’s Mexican Grand Prix, or if Vettel fails to win the race.
The Mercedes man could have wrapped up the honour at last weekend’s US Grand Prix but he surrendered his pole position to finish third.
Up until this point, Vettel has always had a chance of closing the gap to his British rival.
But now Hamilton does not have to rely on Vettel’s result to wrap up the World Championship – and it is likely to be done in Mexico just as it was last year.
“We are approaching this weekend well,” Vettel said.
“We won the last race and for the team it was an important result after the last tough races.
“The mood is good after all, and we have made progress, moving forward, which is good for us.
“Our primary focus is always on winning the next race and I think we know what we have to do to stay in the fight. However, it clearly doesn’t depend only on us.
“We need to look ahead and I think it’s very important that we have started to understand what maybe didn’t work in previous races.
“I think it was necessary to step back to understand and look at these points, but the main thing is that we keep moving forward.
“Obviously, the last couple of days have been important and helped us to make things clearer.”
The Mexican track is different to most because of the altitude at which the drivers race.
“This track is very unusual because of the altitude which makes the air thinner,” Vettel added.
“The approach to this circuit is very simple and straightforward: everybody is trying to put as much downforce on the car as they can, so we’ll see what happens.
“For sure, we’ve been more competitive on straights this year than last year, so hopefully we’ll be the fastest this time too.”
Source : EXPRESS