Rosberg emerges from the Mercedes garage.
Ricciardo has gone P1, lowering the benchmark to 1:39.693.
We now have the FP3 timing screen issue resolves. Sorry about that, chaps.
@Salman: We had a good Alonso one yesterday, but nothing today.
@512: Both teams were placed under administration in the weeks leading up to the race weekend. Neither car will feature this weekend. Caterham looks certain to sit out the whole season, while Marussia's hopes of making either of the next two races are also slim.
@FlyingFinn: They are, but there are limits. There is a system using credits, where teams effectively use a credit to make a change. They can change something like 50% of 48 different engine components, so they have the scope to make changes but are limited.
Hamilton has joined Rosberg out on track.
Rosberg and Hamilton both out on medium rubber.
Rosberg backs off a timed lap after complaining to Mercedes about the feel of his car. "Are you happy with the brakes?" he asks his team. The reply: "They're not perfect Nico, but just try a run."
@fan_of_F1: Honda has been bound by the same rules, so there's no advantage they've gained by joining a season late.
Hamilton's first time puts him fifth. He'll keep improving as those tyres rubber in a bit more, of course.
@blitzer: As is everyone! My money is still on the most obvious choice, McLaren, but lots of fascinating rumours and theories doing the rounds.
Hamilton has a big lock up at Turn 12.
After his earlier concerns, Rosberg has come into the pit lane. So the German clearly not happy with the feel of something on that Mercedes.
Hamiltyon sets a purple first sector and then aborts his run after a spin at Turn 12. Lots of drivers struggling under braking there.
That is likely to prompt a return to the pits, and a switch to medium tyres for final qualifying simulations for Hamilton. Lots of those still to come from the drivers.
After his earlier concerns with brakes, Rosberg is back out on track.
@Spud: Yup, eye-opening stuff from Lotus. Always have to take these times with a pinch of salt, though, as we don't know the fuel loads each car is running. Other teams also making tweaks to set-up and doing varying run plans.
Rosberg still looks very twitchy on the brakes. It might just be me, but Mercedes still seems far from indestructible. The threat of reliability problems hanging over both drivers at such a crucial stage of the season.
Rosberg also runs across the tarmac run-off area at Turn 12.
Alonso is the first man out on soft tyres.
Vettel already on soft tyres, of course, but doing long-run race set-up work.
Alonso starts that lap now so let's see how much time can be gained on these tyres. It was around a second yesterday. His current time is 1:39.915 in fourth.
@Siddhesh: Often it's not that simple. One change offsets other changes, little tweaks here can have a big change in the balance etc. Think about it like this, if you change five things, and one of those things suddenly makes the balance of the car wrong even though you know it's theoretically
faster, what do you do? It's tricky.
@FlyingFinn: Teams decide whether they want a set up closer to the race or qualifying, basically whether to set up for one lap or not. Obviously a race set-up is more conservative than a quali set-up, and is more about consistent pace rather than blistering speed for one lap. Usually teams find a mixture of the two.
Alonso goes purple in all three sectors then, a 1:39.109, so that's a gain of nine tenths on the option tyre.
@Renee: Pirelli has four different compounds, as well as two types of wet tyre. It brings two tyres, a prime and an option, to each race. Drivers must use both tyres during a race. The option is always the softer, quicker tyre.
Everyone has switched to those soft tyres now.
Bottas leaps into P1, six tenths ahead of Ferrari's Alonso. There's that Saturday gain I was talking about from Williams.