@MelhemSakr: Nasr is Brazilian, plus I don't recall Massa being a former team-mate. They are current team-mates.
@Bjorn: Button too. When he has the car exactly as he wants it, he can be in a league of his own.
@tony: Alonso nearly won a title in an inferior car in 2012. That's not my opinion, that's a fact.
@Phil,Maidenhead: I wouldn't mind one of those, Phil!
@tony: No, Red Bull had the most competitive car in 2012. Alonso nearly won the championship in a car which had no real right to be taking a title fight to the final race.
I love watching cars come through the twisty first sector. It makes me wonder why I can't do it so smoothly on F1 2014.
@JPablo: In 2013, five of the 11 teams - Red Bull, Ferrari, McLaren, Mercedes and Williams - took 63% of the sport's underlying revenues. That left just 37% to share between the remaining six teams.
Less than eight minutes to go now as the teams continue their longer runs. This is when they start to get a good idea of how tyres hold up over longer runs - crucial data ahead of Saturday evening when they decide on a race strategy.
Rosberg asked if he can save a bit of fuel but keep his lap times the same.
Replays of Raikkonen running wide at Turn 1. The Finn still not enjoying the feel of that Ferrari.
@satyaban: I would say Kimi is one of the most naturally gifted drivers of the last 20 years. Shouldn't ruin his reputation just because he's having a bad year - when a car isn't to a driver's liking it has a big impact.
The two Red Bulls are back in the garage, everyone else out on track as we enter the final three minutes.
Rosberg the latest man to get onto the astroturf, which sends him a little sideways.
Grosjean is now running a 2014 Lotus nose, by the way, but remains rooted to the foot of the timing screens. It's likely he came out with a heavier fuel load for a late longer run.
As I write that, Grosjean runs wide and enters the track just ahead of Maldonado.
Grosjean asks Lotus if he has a puncture or a broken suspension. Maldonado has now had a spin, so the Lotus drivers are in all sorts of bother.
@JPM2007: I don't think it would have been an impact - he still would have made contact in the way he did. And yes, the FIA is re-evaluating safety in the wake of the accident.
We're into the final 30 seconds of this session.
@tony: Absolutely. Vettel a very sensitive driver, much like Button.
The chequered flag is out.
Raikkonen has stopped in the pit lane, way short of the Ferrari garage.
So there we have it - Hamilton leads yet another Mercedes one-two. The 2012 winner of this race looked in fine form today. Impressive pace from McLaren - but will it transfer into tomorrow? Williams are way down the order but we've seen that team come alive on Saturdays more than once this year.
Race control confirms the 'virtual safety car' has been deployed. This is the new measure brought in after Bianchi's accident - a speed limiter to regulate speeds of drivers without having to deploy a safety car.
The green lights come on at the side of the track and the cars return to the pits at normal speed.
That's all we have time for in FP1. Thanks as always for joining me for this session and please be sure to come back in just over two hours for the afternoon session from the Circuit of the Americas.