Mark Webber topped the times for Red Bull at the end of Friday's two opening practice sessions for this weekend's German Grand Prix.
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The 34-year-old Australian, who won the last race on the circuit in 2009, clocked a fastest time of one minute and 31.770 seconds to outpace Fernando Alonso of Ferrari by one-tenth of a second.
The Sapnish two-times champion Spaniard, who won last year's German race held at Hockenheim, was himself two-tenths of a second clear of Webber's team-mate and German defending champion Sebastian Vettel.
For Vettel, who is seeking his first win on home soil, it was an inauspicious start to a weekend in which he is hoping to further extend his runaway lead in this year's title race.
Alonso's Ferrari team-mate Felipe Massa was fourth ahead of the two Mercedes drivers Michael Schumacher, 42, the seven-times champion, and Nico Rosberg, 26.
Briton Lewis Hamilton was seventh for McLaren ahead of Nick Heidfeld and his Renault team-mate Vitaly Petrov. Adrian Sutil made it five Germans in the top ten in his Force India.
Hamilton's McLaren team-mate and fellow-Briton Jenson button was down in 11th after suffering exhaust problems that required him to sit out the final 20 minutes of the session.