Nico Rosberg edged out team-mate Lewis Hamilton in a close opening practice session ahead of the Spanish Grand Prix.

The two Mercedes drivers were comfortably clear of Ferrari at the top of the times but traded fastest laps throughout the session before Rosberg came out on top with a 1:26.828. Despite the fastest time - 0.07s quicker than Hamilton - Rosberg is under investigation after making a late decision to pit and cutting across in to the pit lane beyond a bollard at the entry.

The two Ferraris were third and fourth - Sebastian Vettel just ahead of team-mate Kimi Raikkonen - but were a second adrift of the early pace set by Mercedes. Raikkonen was also complaining of issues with the front end of his car throughout the session, before later saying his seat was getting too hot in the cockpit.

Toro Rosso enjoyed a strong start to the weekend as Carlos Sainz and Max Verstappen finished the opening session fifth and sixth respectively. However, things did not go so smoothly at Red Bull as Daniel Ricciardo suffered more Renault-based woes. Ricciardo said on Thursday he would be limiting running to protect his power unit - already on the fourth of four available this season - but spent most of the session in the pits and only managed 9 laps.

Ricciardo's late running did allow him to move up to ninth place, and actually took him above team-mate Daniil Kvyat in terms of laps completed. Kvyat finished the session seventh and was running a new front wing for Red Bull, with the team bringing a shorter nose to Barcelona.

Sandwiched between the two Red Bulls was Felipe Massa's Williams, with Felipe Nasr rounding out the top ten. The second Sauber was driven by reserve driver Raffaele Marciello, who did a solid job to end the session in 12th place despite a big moment when he ran wide at Turn 9.

Jolyon Palmer (Lotus) and Susie Wolff (Williams) were also taking part in FP1, finishing directly behind Marciello and ahead of the two McLarens of Fernando Alonso and Jenson Button. Alonso had a spin at Turn 12 right at the end of the session having been struggling with the handling of the updated MP4-30, while Button complained that the balance was "completely wrong".

Click here for a look at the revised McLaren-Honda MP4-30 livery

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Pos Driver Team Time Laps
01 Nico Rosberg Mercedes 1:26.828 28
02 Lewis Hamilton Mercedes 1:26.898 27
03 Sebastian Vettel Ferrari 1:27.806 21
04 Kimi Raikkonen Ferrari 1:27.832 16
05 Carlos Sainz Toro Rosso 1:28.132 27
06 Max Verstappen Toro Rosso 1:28.529 23
07 Daniil Kvyat Red Bull 1:28.785 7
08 Felipe Massa Williams 1:28.831 21
09 Daniel Ricciardo Red Bull 1:29.075 9
10 Felipe Nasr Sauber 1:29.140 14
11 Nico Hulkenberg Force India 1:29.409 20
12 Raffaele Marciello Sauber 1:29.630 15
13 Jolyon Palmer Lotus 1:29.676 21
14 Susie Wolff Williams 1:29.708 22
15 Fernando Alonso McLaren 1:29.813 22
16 Jenson Button McLaren 1:29.817 22
17 Sergio Perez Force India 1:30.096 19
18 Pastor Maldonado Lotus 1:30.110 7
19 Will Stevens Manor 1:32.471 22
20 Roberto Merhi Manor 1:32.647 20
Andrew Lewin

Andrew first became a fan of Formula 1 during the time when Michael Schumacher and Damon Hill were stepping into the limelight after the era of Alain Prost, Nigel Mansell and Aryton Senna. He's been addicted ever since, and has been writing about the sport now for nearly a quarter of a century for a number of online news sites. He's also written professionally about GP2 (now Formula 2), GP3, IndyCar, World Rally Championship, MotoGP and NASCAR. In his other professional life, Andrew is a freelance writer, social media consultant, web developer/programmer, and digital specialist in the fields of accessibility, usability, IA, online communities and public sector procurement. He worked for many years in magazine production at Bauer Media, and for over a decade he was part of the digital media team at the UK government's communications department. Born and raised in Essex, Andrew currently lives and works in south-west London.

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