( CNN ) -- Mercedes occupied their usual position at the top of the practice time sheets Friday as Nico Rosberg recorded the quickest lap head of this weekend 's British Grand Prix . The 28-year-old German , who won the Monaco Grand Prix earlier this season from pole , edged out the Red Bull pair of Mark Webber and three-time defending champion Sebastian Vettel in the second session at Silverstone . His Mercedes teammate and crowd favorite Lewis Hamilton claimed the fifth best time in drying conditions after morning rain had rendered the first runs largely irrelevant . Fellow Briton Paul Di Resta was fourth for Force India . Rosberg 's time of one minute 32.248 seconds edged out Webber , who earlier this week announced he would be quitting Red Bull and F1 at the end of the season . Webber has claimed podium positions in his last four races on the track and once again showed his liking for its high speed straights and corners . But Rosberg , who has headed the grid in three of the last four races , proved unstoppable again in the early sparring although he has some concerns for the weekend . `` Then the only question mark is our race speed . We practised for the race speed today . It seemed to be OK , decent , but I 'm sure it 's still going to be a little bit of a problem for us , '' he told AFP . `` The next thing is that it 's going to be another 10 degrees more tomorrow and Sunday and that could completely change the picture again . '' Vettel 's nearest challengers in this year 's title race , Ferrari 's Fernando Alonso and Kimi Raikkonen for Lotus were were 10th and 13th respectively . Alonso 's teammate Felipe Massa again crashed out , damaging his front suspension , and ended with the 22nd fastest time . 2009 world champion and another home favorite , Jenson Button , was 11th best for the struggling McLaren outfit . Saturday will see further practice ahead of final qualifying for Sunday 's race .
Mark Webber fastest in free practice ahead of Mercedes . Mercedes driver edges out Red Bulls of Mark Webber and Rosberg . Home hope Lewis Hamilton three best at Silverstone . Rosberg won Silverstone earlier this season .