Felipe Massa and Kimi Raikkonen both have spells in P2 before Lewis Hamilton joins his Mercedes team-mate in dipping below 1:40, a 1:39.873 making him second fastest at the moment.

Busy times now on the circuit with everyone except for Will Stevens and Max Verstappen out. Valtteri Bottas goes P2 on the medium tyre with 1:40.406

Nico Rosberg is out for his run on the medium tyre, he is purple through sectors two and three...and he improves the pacesetting time with a 1:39.690.

Image source, McLaren

A blast of cold air as Jenson Button sits in his McLaren waiting to head back out.

The clock has just flicked over into single figures as we head into the final 10 minutes. Expect action to hot up now as drivers strap on medium tyres for qualifying simulations.

Image source, Getty Images

Ferrari's Michael Schumacher in action during the third free practice session for the 1999 Malaysian Grand Prix at Sepang. Schumacher went on to finish second in the race, behind team-mate Eddie Irvine.

Image source, Getty Images

Daniel Ricciardo, on the medium tyre, is the only car on the circuit at the moment.

DRFC#Marshy_Jake: Track looks good plenty of straights for Lewis to pick up speed for pole.

Mighty Joe: Alonso gets the best out of a bad car, will he show Button up this weekend?

J.D.HUGHES: Still missing the real scream of an F1 engine, rather than the moan of an elderly lawnmower, but F1 is always a glorious sight.

Plenty in the pits at the moment as we head into the final 20 minutes of the session. Nico Rosberg leads the way, ahead of Sebastian Vettel, Daniel Ricciardo and Lewis Hamilton.

Turn 9 is proving a tricky corner for plenty of drivers. Robert Merhi spun there earlier and now Lewis Hamilton locks up. "Braking all over the place," he says over the radio.

Lewis Hamilton is out on the circuit and, despite having to navigate a fair bit of traffic, he is off the mark with a 1:41.017 to go P4.

Image source, Getty Images

World champion Michael Schumacher leads Renault's Fernando Alonso during practice for the 2004 Malaysian Grand Prix. Schumacher would go on to win the race, with Alonso finishing seventh having started from 20th on the grid.

Image source, McLaren

Fernando Alonso's first run of the session sees him set a time of 1:42.595, 11th fastest.

Ferrari continue their impressive show of pace from Friday as a 1:40.532 for Sebastian Vettel puts him within two tenths of Nico Rosberg.

Nico Rosberg, on the hard tyre, puts Mercedes into P1 with a 1:40.391 while Daniel Ricciardo improves with a 1:40.590, but it is not enough to knock Rosberg off the top. Ricciardo is on the medium tyres, too.

Don't forget our extra camera streams are up and running during practice, as well as for qualifying and the race. Including driver tracker, pit-lane feed and on-board - which could have been a good place to watch Roberto Merhi fly off.

Roberto Merhi had a wobble at Turn 1 but kept it together. The same cannot be said at Turn 9, though, as the Manor driver spins and is in the gravel. He is able to get himself back on the circuit.

Mercedes: "After a practice start, lots of chatter on tyre and brake temps as Nico Rosberg prepares to start his timed lap.

"Meanwhile, the other fella - aka Lewis Hamilton - is hopping back in...preparations for his prime tyre run under way."

Another driver takes a trip off the circuit, this time Sergio Perez locks up and is on the grass at Turn 9.