F1 Canadian GP: Lewis Hamilton leads practice as Mercedes dominates

Mercedes duo Hamilton and Nico Rosberg dominated the opening period, finishing well ahead of the chasing pack.

Hamilton was 0.415 seconds faster than Rosberg, who was over a second ahead of the Lotus of Romain Grosjean in third.

Mercedes-powered cars dominated practice at Montreal's Circuit Gilles-Villeneuve, which is characterised by three long straights. Four of the top five fastest cars in the session were powered by the Mercedes powerplant.

Force India's Nico Hulkenberg was fourth fastest, followed by the Ferrari of Sebastian Vettel and the Williams of Felipe Massa.

Daniil Kvyat was next up in his Toro Rosso, finishing the session in seventh place ahead of the second Lotus of Pastor Maldonado and McLaren's Fernando Alonso.

Hamilton set the early pace on the soft tyre and remained at the top of the timing sheets for the next 90 minutes.

When pushing harder with half an hour to go he spun at the Turn 10 hairpin but was able to continue unharmed.

Shortly afterwards he mentioned on his team radio that he was losing time with his upshifts.

Carlos Sainz Jr had an eventful session. First he locked-up and spun his Toro Rosso into Turn 1 before continuing, but with 10 minutes to go he stopped at the bottom of the pitlane and was pushed back to his garage by his mechanics.

Half a dozen cars outbraked themselves into the final chicane and had to familiarise their way around a new bollard and lane to return to the track.

Jenson Button suffered problems early on when he radioed back to his garage unable to shift out of second gear.

After a slow installation lap he returned to his McLaren pit and he sat the first half of the session with a gearbox issue.

In the end he was able to complete 25 laps and set the 15th fastest time.

Practice started in overcast conditions, but quickly brightened up. During the session there was a bizarre sight as marshals were removing small metal staples from an area of pitlane where a carpet had been laid during a previous event at the venue.

The second 90-minute session commences at 2pm local time with some forecasts still predicting rain.

PRACTICE RESULTS:

Pos	Driver	Car	Time	Gap	Laps
1	Lewis Hamilton	Mercedes	1m16.212s	-	34
2	Nico Rosberg	Mercedes	1m16.627s	0.415s	38
3	Romain Grosjean	Lotus/Mercedes	1m17.721s	1.509s	35
4	Nico Hulkenberg	Force India/Mercedes	1m17.871s	1.659s	34
5	Sebastian Vettel	Ferrari	1m17.905s	1.693s	25
6	Felipe Massa	Williams/Mercedes	1m17.985s	1.773s	28
7	Daniil Kvyat	Red Bull/Renault	1m18.021s	1.809s	30
8	Pastor Maldonado	Lotus/Mercedes	1m18.026s	1.814s	41
9	Fernando Alonso	McLaren/Honda	1m18.128s	1.916s	34
10	Max Verstappen	Toro Rosso/Renault	1m18.257s	2.045s	24
11	Valtteri Bottas	Williams/Mercedes	1m18.325s	2.113s	40
12	Kimi Raikkonen	Ferrari	1m18.439s	2.227s	26
13	Sergio Perez	Force India/Mercedes	1m18.503s	2.291s	28
14	Daniel Ricciardo	Red Bull/Renault	1m18.775s	2.563s	24
15	Jenson Button	McLaren/Honda	1m18.786s	2.574s	25
16	Felipe Nasr	Sauber/Ferrari	1m18.948s	2.736s	30
17	Carlos Sainz Jr.	Toro Rosso/Renault	1m19.065s	2.853s	23
18	Marcus Ericsson	Sauber/Ferrari	1m19.165s	2.953s	32
19	Roberto Merhi	Marussia/Ferrari	1m20.616s	4.404s	33
20	Will Stevens	Marussia/Ferrari	1m20.624s	4.412s	27

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F1 Canadian GP: Lewis Hamilton leads practice as Mercedes dominates

Formula 1 world champion Lewis Hamilton set the fastest time in the opening practice session for this weekend's Canadian Grand Prix