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Nico Rosberg's early-season dominance looks set to continue after clocking the fastest time during the opening free practice session for the Russian Grand Prix.
The German is looking for his seventh successive win and his fourth of the season and he got his weekend off to the perfect start with a 1:38.127 to outpace his Mercedes team-mate Lewis Hamilton by 0.722 seconds.
Hamilton enjoyed some time at the top of the timesheets but he was unable to match Rosberg's effort in the closing stages of the session.
Sebastian Vettel finished third ahead of his Ferrari team-mate Kimi Raikkonen, with Felipe Massa fifth for Williams. Both Raikkonen and Massa overcame problems with their clutches to post fast times in the final 20 minutes.
Massa's team-mate Valtteri Bottas was seventh ahead of Red Bull's Daniel Ricciardo, while Daniil Kvyat was eighth in the second Red Bull.
Sergio Perez and Carlos Sainz Jr were ninth and tenth for Force India and Toro Rosso.
Russian Grand Prix - Practice 1 Results:
Pos Driver Car Time Gap
1 Nico Rosberg Mercedes 1m38.127s
2 Lewis Hamilton Mercedes 1m38.849s 0.722s
3 Sebastian Vettel Ferrari 1m39.175s 1.048s
4 Kimi Raikkonen Ferrari 1m39.332s 1.205s
5 Felipe Massa Williams/Mercedes 1m39.365s 1.238s
6 Daniel Ricciardo Red Bull/TAG Heuer 1m39.650s 1.523s
7 Valtteri Bottas Williams/Mercedes 1m39.802s 1.675s
8 Daniil Kvyat Red Bull/TAG Heuer 1m40.218s 2.091s
9 Sergio Perez Force India/Mercedes 1m40.287s 2.160s
10 Carlos Sainz Toro Rosso/Ferrari 1m40.654s 2.527s
11 Jenson Button McLaren/Honda 1m40.663s 2.536s
12 Fernando Alonso McLaren/Honda 1m40.771s 2.644s
13 Sergey Sirotkin Renault 1m40.898s 2.771s
14 Felipe Nasr Sauber/Ferrari 1m41.085s 2.958s
15 Max Verstappen Toro Rosso/Ferrari 1m41.134s 3.007s
16 Esteban Gutierrez Haas/Ferrari 1m41.238s 3.111s
17 Romain Grosjean Haas/Ferrari 1m41.385s 3.258s
18 Jolyon Palmer Renault 1m41.671s 3.544s
19 Marcus Ericsson Sauber/Ferrari 1m41.962s 3.835s
20 Pascal Wehrlein Manor/Mercedes 1m42.483s 4.356s
21 Rio Haryanto Manor/Mercedes 1m42.687s 4.560s
22 Alfonso Celis Force India/Mercedes 1m43.432s 5.305s