Lewis Hamilton kept championship leader Sebastian Vettel off the top of the timesheets in both Friday practice sessions for the Korean Formula One Grand Prix while Kimi Raikkonen slammed his Lotus into a tyre wall.
Mexican Esteban Gutierrez will race with Swiss-based Sauber for a second season next year with Russian teenager Sergey Sirotkin signed as test driver, the Formula One team announced on Saturday.
Lewis Hamilton scorched to his third pole position in a row for Mercedes in searing track temperatures at the Hungarian Grand Prix on Saturday.
Germany's Nico Rosberg won a dramatic British Grand Prix for Mercedes on Sunday after one of several explosive tyre failures scuppered team mate Lewis Hamilton's hopes of home victory.
Sebastian Vettel won a tense Hungarian Grand Prix on Sunday in a Ferrari one-two that stretched his championship lead to 14 points after Mercedes rival Lewis Hamilton sportingly surrendered third place to his teammate.
Jules Bianchi had a bright future in Formula One.
Formula One drivers sought reassurance from tyre supplier Pirelli on Friday after world champion Sebastian Vettel and Ferrari's Fernando Alonso suffered punctures in second practice at the Belgian Grand Prix.