Qualifying analysis – could Williams wreck Rosberg’s plans?

Mercedes’ Nico Rosberg needs a perfect weekend in Brazil and thus far he’s had it, topping every session, including all three phases of qualifying, albeit by only a fraction from team mate Lewis Hamilton in the final Q3 tussle. Sunday could, however, see a close race as the Silver Arrows’ aerodynamic advantages over Williams are less effective on a short, smooth track like Interlagos. Much could also depend on the unpredictability of the weather, with drizzle expected at times tomorrow afternoon. We take a team-by-team look at Saturday in Sao Paulo