Valtteri Bottas admits Williams is likely to find Singapore more difficult than the Italian Grand Prix but hopes new parts helps it fight with Red Bull and Ferrari.

The long straights of Monza suited the Mercedes-powered Williams as Bottas finished fourth behind team-mate Felipe Massa in third. While clearly the second quickest team a fortnight ago, Bottas says the focus is on fighting for the same position in Singapore and believes it is a realistic target provided new parts deliver a step in performance.

"I'm looking forward to Singapore, it's a very special race - the setting there is really cool, the track is very challenging and there's no room for mistakes," Bottas said. "It's a night race but the lights are very bright so it doesn't make a big difference to drive, everything just looks awesome which is great for the fans and builds the atmosphere.

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"The race is long. Normally it goes up to two hours, so it's a challenge for the cars with tyre degradation, and for the drivers physically it will be probably the toughest race of the season due to the heat and humidity.

"Singapore could be a little more difficult for us compared to Monza, but we have some aero upgrades which should give us more downforce. We go there hoping to fight with Ferrari and Red Bull but we know Mercedes will be very strong."