@Phoenix: Hard to speculate. He seemed more mentally strong last season and he has certainly grown a lot both as a driver and as a man. With the most dominant car at his disposal its his title to lose, so let's see.
Button goes green in the first sector but pulls out of the lap and returns to the pit lane.
@Canuck: Yes, but engine software issues mean were are unlikely to see them in this session.
Verstappen is on his first timed lap of the 2015 season.
For those asking about an update on the Sauber situation.
@mfbull: He said last year he doesn't need the number one on the car because the other drivers know he's the world champion. He seems pretty unfazed by having number one on his car - it certainly isn't anywhere I've seen.
And an update from Manor Marussia...
Massa's first lap puts him fourth, but he's a long way off Rosberg's benchmark as those tyres get up to speed.
Verstappen set a 1:34.146, which at the moment is four seconds off Rosberg. Sainz then jumps ahead of his Toro Rosso team-mate with a 1:33.811.
@DougPeacock: He also has two crowns either side of his visor, with '08 and '14 written on them.
Hulkenberg's first timed lap of the session is a 1:35.677, putting him sixth. Force India making up for lost time from the winter
Raikkonen splits the Mercedes drivers with a 1:31.773.
@StevenKaufman: We aren't allowed to, the same for any F1 website doing live coverage. That's Bernie for you...
Unless we pay a ridiculous amount of money, of course.
@mfbull: It does seem rather large. It's modern looking for the sake of it.
Bottas jumps above Hamilton into third, setting a 1:31.931. That's just three tenths off Raikkonen's time.
Everyone on medium tyres in this session, remember. We won't see qualifying simulations until FP2 later on.
Magnussen has a moment at Turn 3 and very nearly loses his MP4-30 across the grass, but the Dane saves it.
Vettel has jumped into second, 0.47s ahead of team-mate Raikkonen. That's going to be a fascinating in-house rivalry this year.
I'd like to think we're worth more...
@StevenKaufman: Well, we'll start to get a good idea later this weekend.
Kvyat is on a flying lap in the purplish Red Bull.
@MichaelKuchinsky: Much obliged.