Mercedes put its revamped W08 through its paces with success in the first free practice session for this weekend's Spanish Grand Prix in Barcelona.

Lewis Hamilton, runnin on Pirelli's medium compound,  edged out team mate Valtteri Bottas by 0.029s, leaving Ferrari's Kimi Raikkonen and Sebastian Vettel just under one second behind.

Vettel's running in FP1  was limited by a mechanical issue at the rear of his SF70H, but the Scuderia resolved the problem and sent the German back out without any further delay.

Max Verstappen led Red Bull team mate Daniel Ricciardo in fifth and sixth place.

Kevin Magnussen headed Haas' duo in P7 as both the Dane and Grosjean spent the morning running consistently in the top-ten.

But K-Mag's session came to a premature halt in the closing stages of the session with an apparent gear-box issue.

Nico Hulkenberg and Carlos Sainz closed out the top ten, over two seconds adrift from the front-running Mercedes tandem.

It was a busy morning of running at the Circuit de Catalunya except for McLaren's Fernando Alonso whose Honda power unit expired after just three  corners!

The Spaniard left the circuit dejected to return to his hotel but will be back this afternoon for FP2.

Pos Driver Team Time Gap Laps
1 Lewis Hamilton Mercedes 1:21.521s 28
2 Valtteri Bottas Mercedes 1:21.550s + 0.029s 30
3 Kimi Räikkönen Ferrari 1:22.456s + 0.935s 24
4 Sebastian Vettel Ferrari 1:22.600s + 1.079s 23
5 Max Verstappen Red Bull 1:22.706s + 1.185s 22
6 Daniel Ricciardo Red Bull 1:23.084s + 1.563s 17
7 Kevin Magnussen Haas 1:23.670s + 2.149s 22
8 Romain Grosjean Haas 1:23.758s + 2.237s 23
9 Nico Hülkenberg Renault 1:23.993s + 2.472s 24
10 Carlos Sainz Toro Rosso 1:24.004s + 2.483s 21
11 Sergio Pérez Force India 1:24.188s + 2.667s 23
12 Esteban Ocon Force India 1:24.324s + 2.803s 22
13 Stoffel Vandoorne McLaren 1:24.400s + 2.879s 24
14 Felipe Massa Williams 1:24.618s + 3.097s 34
15 Daniil Kvyat Toro Rosso 1:24.642s + 3.121s 18
16 Marcus Ericsson Sauber 1:24.966s + 3.445s 23
17 Pascal Wehrlein Sauber 1:25.182s + 3.661s 24
18 Lance Stroll Williams 1:25.919s + 4.398s 34
19 Sergey Sirotkin Renault 1:26.293s + 4.772s 10
20 Fernando Alonso McLaren 1

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Phillip van Osten

Motor racing was a backdrop from the outset in Phillip van Osten's life. Born in Southern California, Phillip grew up with the sights and sounds of fast cars thanks to his father, Dick van Osten, an editor and writer for Auto Speed and Sport and Motor Trend. Phillip's passion for racing grew even more when his family moved to Europe and he became acquainted with the extraordinary world of Grand Prix racing. He was an early contributor to the monthly French F1i Magazine, often providing a historic or business perspective on Formula 1's affairs. In 2012, he co-authored along with fellow journalist Pierre Van Vliet the English-language adaptation of a limited edition book devoted to the great Belgian driver Jacky Ickx. He also authored "The American Legacy in Formula 1", a book which recounts the trials and tribulations of American drivers in Grand Prix racing. Phillip is also a commentator for Belgian broadcaster Be.TV for the US Indycar series.

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