A big four days for Sauber coming up.

After running their 2015 machine during the first four days of testing, they are giving the C35-Ferrari its first run out today.

Marcus Ericsson will have to wait to get behind the wheel as it is Felipe Nasr putting it through its paces today.

You are not wrong FK, every driver has been out for at least one lap apart from Esteban Gutierrez in the Haas. 

Nico Rosberg pops the first time on the board with a 1:47.084.

Sound the McLaren on the circuit klaxon!

After managing just three laps on the final day of testing on Friday because of a water leak, Fernando Alonso is straight out on the track this morning hoping to make up for lost time.

Andrew Benson
Chief F1 writer

Mercedes’ level of confidence in the durability of their car is already clear. Midway through the last test, they switched to using two drivers a day. 

That’s because such was the mileage the car was able to do - in the region of 160 laps, or nearly three grand prix distances, a day - the team did not want to risk over-exerting Lewis Hamilton and Nico Rosberg before the start of the season.

They’re sticking with the same programme this week, with Nico Rosberg starting work on Tuesday morning and Lewis Hamilton taking over in the afternoon.

There was probably not much chance for teams and drivers to enjoy a bit of R&R at the weekend as they no doubt spent it looking back over the first test and plotting where improvements could be made.

Well, not much chance for everyone but those at Mercedes, as perhaps highlighted by Lewis Hamilton heading off to LA for a bit of celebrity hobnobbing.

Because their beast of a car can outlasts their drivers, Mercedes are once again alternating Nico Rosberg and Lewis Hamilton today. 

Rosberg gets to go out first this morning, with Hamilton jumping in the car this aft.

Mercedes: Nico Rosberg/Lewis Hamilton

Ferrari: Kimi Raikkonen

McLaren: Fernando Alonso

Red Bull: Daniil Kvyat

Toro Rosso: Max Verstappen

Williams: Valtteri Bottas

Force India: Nico Hulkenberg

Sauber: Felipe Nasr

Haas: Esteban Gutierrez

Manor: Rio Haryanto

Renault: Kevin Magnussen

Ta da! 

Nice, no radical changes, but nice. Thoughts?

The thing that stands out for me most in this picture is how much Max Verstappen and Carlos Sainz look like extras from Adam and the Ants on the boards at the back.

Just me?

Image source, Getty Images

Morning!

Welcome along to our coverage of the second and final pre-season test. 

The cars should be heading out on to the circuit in Barcelona in around 10 minutes, but before we crack on with all that, there's been a reveal this morning - the Toro Rosso's official 2016 livery...

Andrew Benson
Chief F1 writer

There was no mistaking the message from the first pre-season test last week. Mercedes were quickest over a lap on corrected times, fastest down the straights and did the most miles by far. 

With just the next four days of running between now and the start of the season in Australia, will any evidence emerge to suggest the world champions will face a serious challenge this year? 

Over to you, Ferrari.

Image source, Getty Images

Four days down, four to go.

It feels to have flown by but the end of pre-season testing is almost upon us as teams have just 36 hours of track time to get their cars tuned up for the year ahead.

After spending last week racking up the mileage, will Mercedes finally provide a glimpse of their true pace? And have McLaren resolved the reliability problems that showed their face towards the end of the first test?

Let's see what today reveals...