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Ferrari dominated the opening practice session for the Spanish Grand Prix with Sebastian Vettel topping the timesheets from his team-mate Kimi Raikkonen.
Mercedes drivers Nico Rosberg and Lewis Hamilton both went fastest earlier in the session but they dropped off the top when the Ferrari pair took the track, with Vettel producing a 1:23.951 lap to deny Raikkonen by 0.138 seconds.
Rosberg took third with reigning world champion Hamilton finishing the session in fourth ahead of Daniel Ricciardo in the first Red Bull.
Max Verstappen stepped in the Red Bull for the first time following his promotion from Toro Rosso and he impressed with the sixth-fastest time of the morning, as Valtteri Bottas took seventh for Williams.
His team-mate Felipe Massa was ninth just behind the Toro Rosso of Carlos Sainz Jr, with Fernando Alonso completing the top ten in his McLaren.
Daniil Kvyat was 12th fastest on his return to Toro Rosso.
Spanish Grand Prix - Practice 1 results:
Pos Driver Car Time Gap
1 Sebastian Vettel Ferrari 1m23.951s
2 Kimi Raikkonen Ferrari 1m24.089s 0.138s
3 Nico Rosberg Mercedes 1m24.454s 0.503s
4 Lewis Hamilton Mercedes 1m24.611s 0.660s
5 Daniel Ricciardo Red Bull/TAG Heuer 1m25.416s 1.465s
6 Max Verstappen Red Bull/TAG Heuer 1m25.585s 1.634s
7 Valtteri Bottas Williams/Mercedes 1m25.672s 1.721s
8 Carlos Sainz Toro Rosso/Ferrari 1m26.078s 2.127s
9 Felipe Massa Williams/Mercedes 1m26.186s 2.235s
10 Fernando Alonso McLaren/Honda 1m26.243s 2.292s
11 Kevin Magnussen Renault 1m26.576s 2.625s
12 Daniil Kvyat Toro Rosso/Ferrari 1m26.583s 2.632s
13 Nico Hulkenberg Force India/Mercedes 1m26.938s 2.987s
14 Sergio Perez Force India/Mercedes 1m27.064s 3.113s
15 Felipe Nasr Sauber/Ferrari 1m27.253s 3.302s
16 Romain Grosjean Haas/Ferrari 1m27.258s 3.307s
17 Esteban Gutierrez Haas/Ferrari 1m27.283s 3.332s
18 Marcus Ericsson Sauber/Ferrari 1m27.392s 3.441s
19 Jenson Button McLaren/Honda 1m27.610s 3.659s
20 Pascal Wehrlein Manor/Mercedes 1m28.084s 4.133s
21 Rio Haryanto Manor/Mercedes 1m29.052s 5.101s
22 Esteban Ocon Renault