The new benchmark a 1:25.011.
Maldonado has just flashed past the media centre with the yellow-striped Pirelli's - meaning that last time was done on the soft tyre.
@NikhilDuki: Nate is at the track this week, so we'll make sure he gets a chance to witness the cars in action. All told, it's been a bit of a scrappy day for on-track action, so hopefully he'll see a bit more later in the week and can report back.
@Yevgeny: It's an interesting debate, but I would argue that F1 has slightly different DNA to CART. So much of F1 is about individual constructors making the fastest cars to a set of regulations. Those regulations should probably do a better job at capping costs, but the innovation is key to the sport. Just look at the variation in something as small as the "monkey seat" that we were talking about earlier. I think that is still important for a lot of F1 fans.
After a sizeable delay, Wehrlein is out on track hoping to add to his 22 laps for Mercedes this afternoon.
Today has been far from ideal for Mercedes so far.
@Uzayr: It's been a bit of a shocker for Mercedes. Hamilton woke up with a fever and after 11 laps decided he couldn't take anymore. Then the team had to set the car up for reserve driver Wehrlein, but after his first 20 laps they discovered a fuel pump issue.
But... as Nate reports, Wehrlein is back out now.
Meanwhile, Rosberg has neck pains and the team will make a call in the morning on whether he drives tomorrow as he is supposed to. Wehrlein's week might still get better.
Great job by the Sauber boys to get that car rebuilt at the rear. It looked in a bad way from the photos we saw.
@iskimilookinggoodthis...: Yes. He's had a haircut, has some new sunglasses and seems more radiant now he is a father. But, come to think of it, Kimi has always looked good.
Wehrlein has improved again but is still slower than the time he set in the Force India. Read into that what you will... probably that the Mercedes is on high fuel.
A couple of stories coming your way...
@BalazsLengyel: If there is any information, I'm pretty sure it will only be going one way as he is a Mercedes contracted team. But I can't think of another example of a driver driving two F1 cars at an official session in the same day.
@sang_kris: I'm expecting Mercedes to have the edge at the start of the year, but I reckon we'll see big strides from Ferrari, Red Bull and McLaren over the course of the year.
Wow! Another impressive repair job to get Susie Wolff back out in the Williams
With just a few minutes to go we have another red flag...
It rather sums up today. It's Nasr at Turn 9...
@mfbull: A test day when we have a collision is a very unusual test day. But limited track time for all the cars, yes.
None of the drivers have hit 100 laps today. Verstappen has the most with 91 and then Wolff on 86 despite a long period in the garage fixing the front suspension.
And as Laurence reports the limited lap counts, the chequered flags come out, meaning today's session is over.
And as he says, a fitting way for a rather strange day of testing to conclude.
@RacingFan: Nasr this time - we can't see what happened.
So the session has finished under a red flag.
We'll have final times and lap counts plus a report as soon as possible.
Thanks for joining us today. We'll be back tomorrow and over the weekend for more live coverage so do join us again. And we'll try to get through as many questions as is possible - plus throw in the odd picture of random animals.