Nico Rosberg admits he is concerned about the high levels of tyre degredation ahead of the Malaysian Grand Prix. The German was fastest on the harder compounds in the morning session at Sepang on Friday and he initially set the pace early on in the afternoon. However, the times started to drop as drivers switched to the medium tyres. He made a mistake on his first run on the options and eventually finished third fastest behind his Mercedes team-mate Lewis Hamilton and Kimi Raikkonen in the Ferrari. Rosberg warns that the hot and humid conditions will make tyre management crucial during Sunday's race. 'We have different tyres this year and supposedly they suffer a bit less but it...
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