Fernando Alonso set the fastest time of first practice for the Singapore Grand Prix as he beat the two Mercedes drivers.

The top three were closely matched as Ferrari once again showed strong Friday pace, with Alonso setting the mark with a 1:49.056 to top a practice session for the first time since FP1 in Canada. Lewis Hamilton was second quickest - 0.122s slower than Alonso - while Nico Rosberg was only 0.027s behind his team-mate in the second Mercedes despite a trip off track at Turn 7.

Sebastian Vettel was fourth quickest for Red Bull as the reigning constructors' champions looked strong - with Daniel Ricciardo just behind him in fifth - but both over 0.8s slower than Alonso in the opening session. Vettel's session also ended as soon as he crossed the line with the chequered flag waving as he stopped his car at the pit lane exit and reported an engine failure.

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With any Renault power unit deficit less prominent around the streets of Singapore, Jean-Eric Vergne was sixth fastest in the Toro Rosso but caused problems for the two Williams drivers as he stopped at the end of the pit lane, blocking in both Felipe Massa and Valtteri Bottas.

Once the two Williams cars were pushed clear and took to the track, Vergne was wheeled back to the garage and appeared to be unwell as he was given tablets in his cockpit before ending his session early.

Kimi Raikkonen was seventh but a massive 1.7 seconds slower than team-mate Alonso, with the times spread out due to the length of the lap around Marina Bay. Raikkonen didn't enjoy a trouble-free session either, with his right front brake catching fire when pitting late on.

Jenson Button, Daniil Kvyat and Sergio Perez rounded out the top ten, with the two Williams cars comfortably down the field. Despite the close walls of the Singapore street circuit, the biggest scare came for Romain Grosjean who locked up and had to take to the escape road at Turn 7.