Maldonado's first time is a 1:48.739.
Rather worryingly, Caterham tells Kobayashi it has no telemetry for tyre temperatures.
Times coming thick and fast, with Bottas going P1 - lowering the benchmark to 1:46.601 - as Hamilton starts a new flying lap.
Alonso slots in behind Bottas by three tenths as Rosberg leaps into P1, lowering the benchmark to 1:46.028.
Soft tyres all the way this morning, remember. Won't see the super-soft until this afternoon's session.
Fong has a moment and runs wide at the end of the second DRS zone.
Vettel tells Red Bull he is struggling to see the amount of charge available to him in his Red Bull battery.
@RogertheCabinboyCrete: No, it's nothing that cynical. Button said earlier this month he wouldn't move to a less competitive team anyway. It's pretty clear he sees it as McLaren or nothing. If he'd wanted another drive, he would have put pressure on them to decide earlier.
Bottas returns to P1, setting a 1:45.913.
@JamesSpencer: You've guessed this afternoon's poll!
But Hamilton jumps into P1, lowering the bar to a 1:45.141.
And Rosberg improves the target time again, setting a 1:44.860.
Williams running without it's Martini branding this weekend of course, so there's no red
stripe on its livery. Only blue and light blue.
@Ashish: We're working on that technical glitch - I can assure you there's only one! Stevens is a young driver affiliated with Caterham. He briefly signed for Marussia ahead of the Japanese Grand Prix but has switched back to Caterham following their demise.
@Tharshan: Alcohol branding is banned in Abu Dhabi. No alcohol branding on Force India or McLaren, either.
Not an ideal start to Stevens' debut as Caterham says it is investigating a problem on his car.
Massa complains to Williams the bodywork of his car has come loose. There's a really large piece of sidepod lying on the side of the circuit.
@Tharshan: Right you are. I'll find some snaps.
You'll notice no Jonnie Walker branding on that McLaren.
Looks like the same part of Bottas' car has fallen off too, at the same part of the circuit. How bizarre. Both Williams back into the pits.
@Siddhesh: Interestingly, when he was at Williams his mechanics said he was guilty of "going to sleep" in races. Showing great one-lap pace and then dropping off the pace in the races. Would suggest that has been an issue for him at times this season.
Everyone back into the pits as we enter the final hour of the session. Teams will now hand back those additional soft tyres to Pirelli.
Silence descends over the Yas Marina circuit once again with all the drivers back in the pits.