Nico Rosberg set the pace in opening practice for the British Grand Prix, outpacing teammate Lewis Hamilton despite hitting trouble early in the session.
Rosberg's best of 1:34.274, set right at the end of the 90 minutes, was just 0.070 seconds quicker than Hamilton, who had dominated the session after the German had suffered a hydraulics failure early on.
Rosberg managed just 11 laps in the end, but still managed to have the edge over Hamilton in the end.
The Mercedes duo were miles in front of its rivals, with Toro Rosso's Max Verstappen in third, albeit over a second behind Rosberg.
Kimi Raikkonen was fourth for Ferrari, ahead of Carlos Sainz in the second Toro Rosso, the Faenza-based squad having a strong start to the weekend.
Nico Hulkenberg in the updated Force India and Felipe Massa in the Williams completed the top ten.
Susie Wolff was the fastest of the three Friday drivers on track today, the Williams tester finishing in 13th, with Lotus' Jolyon Palmer in 14th and Raffaele Marciello 15th in the Sauber.
The story of the session
Rosberg was the first man to complete a timed lap, the German setting the early pace as teams took advantage of the extra set of tyres during the first half hour of running.
Hamilton was briefly on top of the times before he lost control of his car at Stowe, spinning after running too wide onto the AstroTurf.
There was further drama for Mercedes just a couple of minutes later, when Rosberg was asked to park his car after suffering a loss of hydraulic pressure after just five laps.
His car was taken back to the pits, but Rosberg only got back out with some six minutes of the session left.
After recovering from his spin, Hamilton went quickest with a lap of 1:35.536, improving to a 1:35.391 on his following lap.
Still on the same run, Hamilton dipped into the 1:34s to set a benchmark that remained unbeaten.
The Mercedes driver would go even faster later in the session, improving to a 1:34.344.
The McLaren drivers spent most of the session in the garage, with Fernando Alonso completing his first timed lap with half a second left as the team did not want to stress the old Honda engine.
Teammate Jenson Button did an installation lap right at the start of the season, but did not return to the track until there were 10 minutes left on the clock. He finished down in 18th, behind Alonso.
|03||M. Verstappen||Toro Rosso||1:35.530||+1.256||18|
|05||C. Sainz||Toro Rosso||1:35.669||+1.395||33|
|07||D. Ricciardo||Red Bull||1:35.818||+1.544||26|
|08||D. Kvyat||Red Bull||1:35.876||+1.602||22|
|09||N. Hulkenberg||Force India||1:36.157||+1.883||28|
|12||S. Perez||Force India||1:36.889||+2.615||26|