Nico Rosberg wants to win title 'properly'

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Nico Rosberg is still refusing to adopt a conservative mentality as he closes in on a maiden world championship, saying he wants to win the title "properly" with victory in Brazil.

The German driver leads Lewis Hamilton by 19 points with two races to spare, knowing he can finish second and third at the remaining two rounds to win the title. He will be crowned champion a race early if he wins on Sunday and has repeatedly stated he is not going to back off.

When asked after FP2 if he will race "safe" in Brazil and do what he needs to become champion, Rosberg said: "No, I want to win properly."

Though he's topped just one practice session since his last win at Suzuka, with Hamilton going quickest in both on Friday at Interlagos, Rosberg rubbished the suggestion he's nursing his engine to guard against reliability issues.

"Definitely not. Still trying to be the fastest and still trying to win on Sunday."

Friday revealed little about the rest of the weekend, with the hotter temperatures of the afternoon opening the gap between Mercedes and Red Bull. With cooler temperatures and rain forecast for the rest of the weekend Rosberg feels the day was not a true indicator of the pecking order.

When asked if Red Bull or Williams, who impressed in FP2, would pose the biggest threat on Sunday, he replied: "The main threat is Lewis! After that then there is still the Red Bulls, but let's see.

"We still need to do a lot of work, tomorrow morning in the colder conditions, let's see, that could make it more interesting. In terms of competitors it's difficult to say, Red Bull looked very very quick and close this morning and then this afternoon they were a bit further away, so we're not quite sure."