NURBURGRING (AFP) - 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. 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.