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Lewis Hamilton and Nico Rosberg secured a Mercedes one-two in the first free practice session for the European Grand Prix in Azerbaijan.
Several drivers made mistakes as they got to grips with the new Baku City Circuit with Red Bull's Daniel Ricciardo suffering heavy damage to his car as he crashed on the exit of Turn 15.
Hamilton brushed the side of his Mercedes against the wall of the street circuit but he escaped without too much trouble and went on to post a 1:46.435 lap-time to finish three-tenths of a second ahead of his team-mate.
Williams' Valtteri Bottas was best of the rest in third, while it proved to be a pleasing day for Fernando Alonso as he brought his McLaren home in fourth ahead of Sebastian Vettel in the Ferrari.
Sergio Perez took sixth for Force India with Jenson Button seventh in the second McLaren, while Felipe Massa was eighth for Williams.
Toro Rosso's Carlos Sainz and Force India's Nico Hulkenberg complete the top ten.
Ricciardo managed to finish 13th but the Red Bull mechanics have a lot of work to do ahead of the second practice session after the Austrlian ripped the right-rear off his RB12.
European Grand Prix - Practice 1 results:
1 Lewis Hamilton Mercedes 1m46.435s
2 Nico Rosberg Mercedes 1m46.812s 0.377s
3 Valtteri Bottas Williams/Mercedes 1m47.096s 0.661s
4 Fernando Alonso McLaren/Honda 1m47.989s 1.554s
5 Sebastian Vettel Ferrari 1m48.627s 2.192s
6 Sergio Perez Force India/Mercedes 1m48.922s 2.487s
7 Jenson Button McLaren/Honda 1m49.019s 2.584s
8 Felipe Massa Williams/Mercedes 1m49.125s 2.690s
9 Carlos Sainz Toro Rosso/Ferrari 1m49.267s 2.832s
10 Nico Hulkenberg Force India/Mercedes 1m49.301s 2.866s
11 Romain Grosjean Haas/Ferrari 1m49.611s 3.176s
12 Kimi Raikkonen Ferrari 1m49.635s 3.200s
13 Daniel Ricciardo Red Bull/Renault 1m49.778s 3.343s
14 Esteban Gutierrez Haas/Ferrari 1m50.167s 3.732s
15 Marcus Ericsson Sauber/Ferrari 1m50.473s 4.038s
16 Max Verstappen Red Bull/Renault 1m50.485s 4.050s
17 Daniil Kvyat Toro Rosso/Ferrari 1m50.551s 4.116s
18 Jolyon Palmer Renault 1m50.910s 4.475s
19 Kevin Magnussen Renault 1m50.939s 4.504s
20 Pascal Wehrlein Manor/Mercedes 1m51.219s 4.784s
21 Felipe Nasr Sauber/Ferrari 1m51.771s 5.336s
22 Rio Haryanto Manor/Mercedes 1m51.925s 5.490s