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Mercedes' Lewis Hamilton posted the fastest time during an eventful opening practice session for the Monaco Grand Prix.
The morning session was stopped prematurely when Hamilton's team-mate Nico Rosberg appeared to disturb a manhole cover at the bottom of the hill at Turn 1. The manhole cover then bounced across the track and underneath the McLaren of Jenson Button, destroying the car's front wing and puncturing a tyre.
Officials decided to bring the session to a halt in order for the manhole cover to be repair ahead of the afternoon session.
Before the drama it was Hamilton who clocked the fastest time around the streets of the principality, producing a lap of 1:15.537 midway through the session and it was to be enough for him to end the morning on top, one tenth ahead of Rosberg.
Ferrari's Sebastian Vettel was third with Red Bull drivers Daniel Ricciardo and Max Verstappen fourth and fifth respectively.
Daniil Kvyat finished sixth in the Toro Rosso ahead of Force India pair Nico Hulkenberg and Sergio Perez, while Kimi Raikkonen could only manage ninth in his Ferrari.
Carlos Sainz completed the top ten for Toro Rosso.
A number of drivers, including Hamilton, made mistakes at Ste Devote with Felipe Massa severely damaging the left front and rear of his Williams, resulting in the virtual safety car to be activated.
Monaco Grand Prix - Practice 1 Results:
Pos Driver Car Time Gap
1 Lewis Hamilton Mercedes 1m15.537s
2 Nico Rosberg Mercedes 1m15.638s 0.101s
3 Sebastian Vettel Ferrari 1m15.956s 0.419s
4 Daniel Ricciardo Red Bull/Renault 1m16.308s 0.771s
5 Max Verstappen Red Bull/Renault 1m16.371s 0.834s
6 Daniil Kvyat Toro Rosso/Ferrari 1m16.426s 0.889s
7 Nico Hulkenberg Force India/Mercedes 1m16.560s 1.023s
8 Sergio Perez Force India/Mercedes 1m16.697s 1.160s
9 Kimi Raikkonen Ferrari 1m16.912s 1.375s
10 Carlos Sainz Toro Rosso/Ferrari 1m17.130s 1.593s
11 Valtteri Bottas Williams/Mercedes 1m17.562s 2.025s
12 Romain Grosjean Haas/Ferrari 1m17.599s 2.062s
13 Fernando Alonso McLaren/Honda 1m17.838s 2.301s
14 Esteban Gutierrez Haas/Ferrari 1m17.909s 2.372s
15 Jenson Button McLaren/Honda 1m17.920s 2.383s
16 Felipe Nasr Sauber/Ferrari 1m18.187s 2.650s
17 Kevin Magnussen Renault 1m18.274s 2.737s
18 Marcus Ericsson Sauber/Ferrari 1m18.301s 2.764s
19 Felipe Massa Williams/Mercedes 1m18.746s 3.209s
20 Jolyon Palmer Renault 1m18.871s 3.334s
21 Rio Haryanto Manor/Mercedes 1m20.528s 4.991s
22 Pascal Wehrlein Manor/Mercedes 1m20.868s 5.331s