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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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
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