SILVERTSONE, England - Nico Rosberg posted the fastest time during the first practice session ahead of the 2015 British Grand Prix on Friday (July 3).
Rosberg finished 0.07 seconds ahead of Hamilton, who is chasing his third victory at his home race, and has a 10-point lead over Rosberg after eight races.
Hamilton missed much of the session after going off due to a loss of hydraulic power at Silverstone.
ELECTRONICS AN ISSUE?
Mercedes team boss Toto Wolff says "maybe it was just software electronics" at fault for Rosberg's problems.
Toro Rosso's Max Verstappen was third quickest, followed by Ferrari's Kimi Raikkonen.
Read: As it happened - 2015 British GP 1st practice
2015 British GP results:
First practice
1 Nico Rosberg (Germany) Mercedes 1min34.274
2 Lewis Hamilton (Britain) Mercedes 1min34.344
3 Max Verstappen (Netherlands) Toro Rosso 1min35.530
4 Kimi Raikkonen (Finland) Ferrari 1min35.588
5 Carlos Sainz Jr (Spain) Toro Rosso 1min35.669
6 Sebastian Vettel (Germany) Ferrari 1min35.739
7 Daniel Ricciardo (Australia) RedBull 1min35.818
8 Daniil Kvyat (Russia) RedBull 1min35.876
9 Nico Hulkenberg (Germany) Force India 1min36.157
10 Felipe Massa (Brazil) Williams-Mercedes 1min36.469
11 Felipe Nasr (Brazil) Sauber 1min36.855
12 Sergio Perez (Mexico) Force India 1min36.889
13 Susie Wolff (Britain) Williams-Mercedes 1min37.242
14 Jolyon Palmer (Britain) Lotus 1min37.262
15 Raffaele Marciello (Italy) Sauber 1min37.372
16 Pastor Maldonado (Venezuela) Lotus 1min38.080
17 Fernando Alonso (Spain) McLaren 1min38.222
18 Jenson Button (Britain) McLaren 1min38.860
19 Will Stevens (Britain) Marussia 1min38.981
20 Roberto Merhi (Spain) Marussia 1min40.477
Stay with Wheels24 for live updates for the 2015 British Grand Prix.