Lewis Hamilton set the fastest time of FP1 for the Monaco Grand Prix as a loose drain cover caused damage for Nico Rosberg and Jenson Button to end the session early.

Rosberg was 0.101s off Hamilton's time of 1:15.537 when he exited St Devote and ran over a loose drain cover, flicking it out on to the track and in to the path of the following McLaren. Button could not avoid the object which he ran over with his front right wheel, damaging the front wing and causing a puncture.

Rosberg also had a puncture from the incident - which could have been much more serious had the drain cover been flicked up higher in front of Button - and the session was red flagged with four minutes remaining, leaving the two Mercedes drivers top of the times.

Sebastian Vettel was third quickest for Ferrari, 0.419s adrift of Hamilton and over 0.3s clear of the Red Bull pair of Daniel Ricciardo and Max Verstappen. Daniil Kvyat was sixth fastest and just 0.055s slower than the man who replaced him at Red Bull.

The loose drain cover was not the only incident at St Devote, with Felipe Massa crashing early in the session. Massa lost the rear of the Williams at the apex and hit the barrier on the outside of the track, damaging the whole left side of his car quite heavily.

Jolyon Palmer also hit the wall later in the session, sliding wide at Tabac and damaging his right rear suspension. The contact forced Palmer to stop at the Swimming Pool, ending his running with a little over 20 minutes to go.

While a number of drivers ran wide at St Devote, Valtteri Bottas had a major moment in the tunnel late in the session. The Williams driver had the rear of the car step out on him at high speed in the tunnel and just managed to catch it before the car touched the barrier in an excellent display of car control.

Esteban Gutierrez similarly did well to hold on to his car when the rear of his Haas snapped away under braking for the Nouvelle Chicane. However, Gutierrez later had to stop at Portier due to a technical problem.

Mercedes tried the ultrasoft tyre for the first time from the start of the opening practice session, with the majority of teams following suit. The new compound is making its debut in Monaco this weekend.

AS IT HAPPENED: Monaco Grand Prix - FP1

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Keep up to date with all the F1 news via Facebook and Twitter

Pos Driver Team Time Laps
01 Lewis Hamilton Mercedes 1:15.537 31
02 Nico Rosberg Mercedes 1:15.638 39
03 Sebastian Vettel Ferrari 1:15.956 26
04 Daniel Ricciardo Red Bull 1:16.308 29
05 Max Verstappen Red Bull 1:16.371 30
06 Daniil Kvyat Toro Rosso 1:16.426 37
07 Nico Hulkenberg Force India 1:16.560 34
08 Sergio Perez Force India 1:16.697 28
09 Kimi Raikkonen Ferrari 1:16.912 24
10 Carlos Sainz Toro Rosso 1:17.130 39
11 Valtteri Bottas Williams 1:17.562 44
12 Romain Grosjean Haas 1:17.599 33
13 Fernando Alonso McLaren 1:17.838 27
14 Esteban Gutierrez Haas 1:17.909 25
15 Jenson Button McLaren 1:17.920 26
16 Felipe Nasr Sauber 1:18.187 29
17 Kevin Magnussen Renault 1:18.274 34
18 Marcus Ericsson Sauber 1:18.301 33
19 Felipe Massa Williams 1:18.746 10
20 Jolyon Palmer Renault 1:18.871 22
21 Rio Haryanto Manor 1:20.528 28
22 Pascal Wehrlein Manor 1:20.868 25
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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