Felipe Massa does a 1:19.420 on the ultrasofts - his best of the day but still not enough to take top spot from Valtteri Bottas.

Dom: Are McLaren still out or changing an engine again?  

Fernando Alonso has been out a reasonable amount this morning, having done 27 laps, but he is back at base now. 

Valtteri Bottas and Felipe Massa are both out for a bit more pre-lunch fun. Both on ultrasofts.

Image source, .

Hard to argue with Stuie Neale's top three fastest teams for 2017, although several people have.

Get your predictions in here.

Whatever the fluids system check entailed, Kimi Raikkonen is getting faster and faster. A 1:20,472 nudges him another place into P4, again on softs.

He's 1.1s slower than Valtteri Bottas, who set his benchmark lap on supersofts.

Chris Marsh: 11.14 Surely a fluids system check is a quick nip to the loo before heading out just to be sure....   

A personal best for Kimi Raikkonen as he does a 1:21.324 on softs to move up to fifth. The Finn briefly heads in before returning to the circuit. Making up for lost time.

1) Valtteri Bottas - 52 laps

2) Felipe Massa - 51 laps

3) Pascal Wehrlein - 45 laps

4) Nico Hulkenberg; Romain Grosjean - 40 laps

5) Sergio Perez - 37 laps

6) Max Verstappen - 34 laps

7) Carlos Sainz - 32 laps

8) Fernando Alonso - 25 laps

9) Kimi Raikkonen  21 laps

ND: Be fantastic if the Williams was at the top and gave Massa a world title, he really does deserve it!  

Felipe Massa, on a set of ultras, goes even quicker as he rattles off a 1:19.487. It's not enough to usurp Valtteri Bottas but it is his best time in testing so far.

S'alright. Kimi just needed a glass of water...

Felipe Massa joins his former Williams team-mate Valtteri Bottas in dipping below 1:20 as the Brazilian does a 1:19.909. 

It's amazing to think that the original plan was for Massa to be feet up on sofa right about now, enjoying retirement, but instead he is driving the equivalent of three Spanish GPs in two days, posting impressive times and looking stronger than ever.

F1's Benjamin Button.

Conor, what are you doing to me? Here I am hunched over a laptop and there you are... there!

F1 journalist Dan Knutson in Barcelona: Kimi Raikkonen, back on track, spent one hour and 55 minutes in the pits. There was nothing broken on the Ferrari, but the crew had to check over the hydraulic systems.  

Will you look at that, McLaren just behind Ferrari on the timesheet. 

Whatever issue that has kept Kimi Raikkonen confined to the Ferrari garage appears to have been resolved. He's back out on the track now with one hour to go until lunch.

1) Valtteri Bottas (Mercedes) - 1:19.310 - supersoft

2) Felipe Massa (Williams) - 1:20.181 - soft

3) Max Verstappen (Red Bull) - 1:20.432 - soft

4) Nico Hulkenberg (Renault) - 1:21.213 - supersoft

5) Carlos Sainz (Toro Rosso) - 1:22.139 - soft

6) Kimi Raikkonen (Ferrari) - 1:22.926 - medium

7) Fernando Alonso (McLaren) - 1:23.210 - soft

8) Romain Grosjean (Haas) - 1:23.525 - medium

9) Sergio Perez (Force India) - 1:23.735 - medium

10) Pascal Wehrlein (Sauber) - 1:24.896 - medium

F1 journalist Dan Knutson in Barcelona: Kimi Raikkonen is out of the Ferrari and not looking happy. Word is that something broke on the car. 

Andrew Benson
Chief F1 writer

Image source, Getty Images

Any time a driver resets the benchmark lap time it's bound to create a bit of attention, but let's not get our knickers in a twist about that 1:19.310 from Valtteri Bottas in the Mercedes. 

The Finn set it on super-soft tyres, which Pirelli calculates to be 0.8secs faster than the soft. So in actual fact, that time is slower - by about 0.3secs - than the 1:19.9 set by Sebastian Vettel's Ferrari last week. There are many other variables, too, of course. But that's just the one we know about right now. 

Yes, it's a competitive time. But it has not on the face of it redefined the possible, by any stretch of the imagination.

Vaishach: If McLaren solve their reliability issues quickly I think they can be at the top consistently!