F1: Rosberg, Vettel, Hamilton & Button on Malaysia practice

Mercedes's Nico Rosberg and other F1 drivers discuss the "challenging" conditions as rain affects the second practice session ahead of Sunday's Malaysian Grand Prix.

Kimi Raikkonen, winner last time out in Australia in his Lotus, looked impressive as he finished second in P1 behind Red Bull's Mark Webber, before topping the timesheets in P2.

Reigning champion Sebastian Vettel says the conditions were "not ideal", Rosberg's team-mate Lewis Hamilton admits Mercedes "did not learn much" due to the weather, while McLaren's Jenson Button is "pleased" at how the car performed on the intermediate tyres.

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