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Nico Rosberg got the better of Mercedes team-mate Lewis Hamilton in the first free practice session for the Austrian Grand Prix.
Rosberg clocked a 1:07.373 lap to deny Hamilton top spot by 0.357seconds with Ferrari's Sebastian Vettel taking third.
Hamilton had enjoyed a brief spell at the top of the timesheets but it was the German who emerged to post the fastest time of the morning with Kimi Raikkonen ensuring Mercedes and Ferrari dominated the first session.
Raikkonen posted the fourth-fastest time to finish ahead of Red Bull's Daniel Ricciardo with Carlos Sainz Jr sixth for Toro Rosso.
Felipe Massa was the quickest of the Williams cars in seventh just one place better than Max Verstapen, who damaged his steering after hitting the kerbs.
Toro Rosso's Daniil Kvyat and the Williams of Valtteri Bottas were ninth and tenth respectively.
Austrian Grand Prix - Practice 1 Results:
1 Nico Rosberg Mercedes 1m07.373s
2 Lewis Hamilton Mercedes 1m07.730s 0.357s
3 Sebastian Vettel Ferrari 1m08.022s 0.649s
4 Kimi Raikkonen Ferrari 1m08.222s 0.849s
5 Daniel Ricciardo Red Bull/Renault 1m08.528s 1.155s
6 Carlos Sainz Toro Rosso/Ferrari 1m08.803s 1.430s
7 Felipe Massa Williams/Mercedes 1m08.824s 1.451s
8 Max Verstappen Red Bull/Renault 1m08.962s 1.589s
9 Daniil Kvyat Toro Rosso/Ferrari 1m08.990s 1.617s
10 Valtteri Bottas Williams/Mercedes 1m08.998s 1.625s
11 Romain Grosjean Haas/Ferrari 1m09.078s 1.705s
12 Nico Hulkenberg Force India/Mercedes 1m09.280s 1.907s
13 Jenson Button McLaren/Honda 1m09.365s 1.992s
14 Fernando Alonso McLaren/Honda 1m09.567s 2.194s
15 Kevin Magnussen Renault 1m09.707s 2.334s
16 Pascal Wehrlein Manor/Mercedes 1m09.775s 2.402s
17 Jolyon Palmer Renault 1m09.851s 2.478s
18 Marcus Ericsson Sauber/Ferrari 1m09.929s 2.556s
19 Esteban Gutierrez Haas/Ferrari 1m10.110s 2.737s
20 Felipe Nasr Sauber/Ferrari 1m10.314s 2.941s
21 Rio Haryanto Manor/Mercedes 1m10.493s 3.120s
22 Alfonso Celis Force India/Mercedes 1m10.860s 3.487s