Valtteri Bottas expects this weekend's Malaysian Grand Prix to be "a real challenge" for each team on the Formula One grid.
Williams performed well during pre-season but had an indifferent weekend at the season-opening race in Australia earlier this month.
Bottas finished fifth but could perhaps have challenged for a higher position had he not suffered a puncture, while Felipe Massa was forced to retire after an incident in the first corner.
Although Williams head to Malaysia this week full of confidence that they can produce better results, Bottas knows that the heat and humidity in Kuala Lumpur will make it extremely difficult for everyone to get their cars performing...
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