Michael Schumacher's farewell from F1, Lewis Hamilton's final race with McLaren, and a championship to be decided in a race that looks set to be a thriller. Edd Straw picks the five hottest topics ahead of the Brazilian GP

Vettel versus Alonso

The situation is simple enough for Vettel. If he finishes in the top four, he's champion irrespective of what Alonso does. And with rain on the horizon, it's worth noting that if the race doesn't go to three-quarters distance, he also wins it even if he's in the wall and Alonso wins.

Alonso has to be on the podium to have any chance. If he's second, he needs Vettel to be eighth or worse and if he's third, he needs Vettel 10th or lower.

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