Sebastian Vettel says he'll have to make the right decisions at the right time if he's to extend his winning streak at the Brazilian Grand Prix this weekend.The World Champion is looking to claim a record-equalling ninth straight victory on Sunday but was knocked off his P2 perch for the first time since Korea after Mercedes' Nico Rosberg topped both sessions. Both practice sessions were held in changeable conditions typical of Interlagos, with rain falling through most of the second session. More rain is forecast for qualifying and perhaps the race as well, with Vettel knowing that a certain degree of opportunism will probably be needed if he's to chalk up win number 13 of 2013. "Yes....
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