Lewis Hamilton leaves the pits on scrubbed mediums to head out for what will likely be his final run with just 14 minutes remaining of this session. He's currently fastest, and with Nico Rosberg second Mercedes are on target for their 10th one-two of the season in this session.

Daniil Kvyat, Max Verstappen and Kevin Magnussen have been busy this morning, each clocking up 22 laps - more than anyone else. At the other end of the scale, Daniel Ricciardo has managed just five as his Red Bull team continue to work on an engine problem.

Image source, Lotus F1/Twitter

Lotus F1 on Twitter:, external Romain's back in for a chat. That nose has got everyone talking, us included...

Chris McGonagle:, external I really want Lewis to win this weekend!! Fingers and toes crossed.

With 20 minutes to go, Lewis Hamilton leads the way with a best lap of 1:39.841, three tenths of a second quicker than Mercedes team-mate Nico Rosberg. Jenson Button is a tenth further back in third, with Daniil Kvyat fourth and Kevin Magnussen fifth.

1) Ham 2) Ros 3) But 4) Kvy 5) Mag 6) Alo 7) Vet 8) Nas 9) Hul 10) Ver

Felipe Nasr, who is borrowing Valtteri Bottas' Williams for this session, is doing a good job. He's currently eighth quickest, three and a half tenths quicker than regular race driver Felipe Massa.

BBC F1 pit-lane reporter Jennie Gow reports that the Red Bull mechanics are still working on Daniel Ricciardo's car and it is looking increasingly likely that he will have to change the engine. The Australian has left the garage because it's unlikely he'll be back out in this session.

Adrian Sutil makes a mess of it down at Turn 19, the Sauber driver spinning after getting a wheel on the kerb and lighting up the tyres before rolling to a stop, engaging first gear and getting going again.

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Next time around, Lewis Hamilton goes even quicker, improving to a 1:40.044. Medium tyres are still the order of the day. We probably won't see the soft rubber until the second session.

Lewis Hamilton has flexed his muscles for the first time in this session, the 2008 world champion leaving the garage and wasting little time in getting up to speed. The Briton clocks a 1:40.106, with his Mercedes team-mate Nico Rosberg slotting into second, 0.127 seconds off the pace.

Pastor Maldonado has a moment up at Turn One, running wide before rejoining. Nico Rosberg is off track, too, down at Turn 20, but escapes unscathed.

Williams:, external No major upgrades for the remaining races but we are still developing the car to make sure we get the most out of every race. Constructors' championship is our primary focus and so we won't rest until the chequered flag in Abu Dhabi!

With a little over 30 minutes remaining, here's how they stand:

1) Button 2) Rosberg 3) Kvyat 4) Magnussen 5) Alonso 6) Vettel 7) Hulkenberg 8) Hamilton 9) Raikkonen 10) Verstappen

Sebastian Vettel improves to the fourth quickest time with a 1:41.463, 1.1 seconds off the pace. Russian Daniil Kvyat is just a tenth further back in fifth in the Toro Rosso.

Jenson Button is back on top with a 1:40.319, seven tenths of a second quicker than McLaren team-mate Kevin Magnussen. Fernando Alonso is third, three tenths further back, with Lewis Hamilton fourth, Kimi Raikkonen fifth and Nico Rosberg sixth.

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At last, Adrian Sutil has an F1 record to his name. Unfortunately, it's not one he would have dreamed of having. The German has now competed in a record 125 grands prix without ever finishing on the podium.

There were also rumours that Sebastian Vettel would miss qualifying altogether because by taking a sixth new engine, the penalties would add up to mean he would have to start from the pit lane, even if he took pole.

"We'll certainly be taking part in qualifying," said Red Bull boss Christian Horner. "But we have to be very careful with our mileage, he has to get through three race weekends with this unit."

Daniel Ricciardo's running in this session has stalled as he has an engine issue. Red Bull boss Christian Horner said: "Some alarm bells were triggered on the last run and at the moment, the boys are getting into it to try and find out what it is."

Everyone has set a time in this session apart from Nico Hulkenberg in the Force India with 50 minutes remaining.

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This weekend, Mercedes have the chance to tie McLaren's single season record of 10 one-two finishes, set by Ayrton Senna and Alain Prost in 1988, albeit in a 16-race season.