| 13:50:19
| Welcome to F1-Live.com and our live coverage of the US Grand Prix. The second practice session of the day begins shortly. |
| 13:52:36
| The morning session saw Fernando Alonso firmly in command as he stopped the clocks in 1:11.925s, over four tenths ahead of the field. Most of the front-runners, minus Ferrari, opted to run the soft tyre to set fast lap times. |
| 13:54:26
| Nick Heidfeld was second fastest in his BMW Sauber three-tenths clear of Lewis Hamilton in the second McLaren. Sebastian Vettel, who has taken over driving duties this weekend from Robert Kubica, was fourth fastest. |
| 13:56:25
| Kimi Raikkonen and Felipe Massa were fifth and seventh fastest for Ferrari with Nico Rosberg in between in his Williams Toyota. David Coulthard was eighth fastest ahead of Jenson Button in the Honda and Mark Webber in the second RB3. |
| 13:58:14
| Renault did not show a great deal of pace in the morning session with Giancarlo Fisichella 16th and Heikki Kovalainen 19th. It was an incident free session except for Adrian Sutil who spun off into the gravel in the final seconds of the session. |
| 14:00:12
| The second 90-minute practice session is now underway. |
| 14:00:23
| Alex Wurz has taken over from Williams test driver Kazuki Nakajima and will be recording his first laps of the day. |
| 14:00:59
| Ralf Schumacher and Nick Heidfeld are the first on track for Toyota and BMW Sauber. |
| 14:01:42
| Super Aguri send out their drivers as do Toro Rosso. Vettel and Trulli also join the action. |
| 14:02:10
| Schumacher starts his first timed lap. Heikki Kovalainen is on track. |
| 14:03:05
| Heidfeld has pitted, the rest are on timed laps. |
| 14:03:39
| Schumacher's first lap is about 2.5s down on his best from this morning. Fisichella and Coulthard on track. |
| 14:04:14
| The first timed laps are coming in and Vettel moves fastest from Liuzzi and Speed. |
| 14:05:03
| Wurz, Rosberg, Barrichello and others now on track. |
| 14:06:01
| Coulthard moves fastest now in his Red Bull. |
| 14:07:00
| Fisichella moves second fastest ahead of Webber. |
| 14:07:35
| Webber has moves third fastest ahead of Vettel and Liuzzi aho has pitted. |
| 14:08:20
| Fernando Alonso is on track in his McLaren Mercedes |
| 14:09:24
| Heidfeld is back out after his early pit stop. |
| 14:09:45
| Hamilton is now on track in the second MP4-22. |
| 14:10:11
| Heidfeld moves second fastest but Alonso is on a hot lap. |
| 14:10:42
| Alonso moves fastest, about eight-tenths off his morning best. Mass is on track in his Ferrari. |
| 14:11:13
| Raikkonen joins the action in the second Ferrari. |
| 14:11:39
| Hamilton heads straight back into the pit as does Massa. |
| 14:13:23
| Nick Heidfeld runs off track and returns to the BMW Sauber pit. |
| 14:14:04
| Raikkonen moves third fastest, a second off Alonso's best. |
| 14:15:26
| Sutil and Albers are moving up the order for Spyker and are roughly on the same pace as in the morning session. |
| 14:16:01
| Ralf Schumacher moves tenth fastest. |
| 14:17:35
| Hamilton is back on track. He has yet to set a lap time. |
| 14:20:30
| Now Hamilton takes over at the head of the timesheets with a lap a tenth better than he managed this morning. |
| 14:21:01
| Massa remains in the pits. He is the only driver not to set a lap time so far. |
| 14:22:12
| Nick Heidfeld moves fourth fastest ahead of Raikkonen who has pitted. |
| 14:23:54
| Alex Wurz, an amzing third last time out in Montreal courtesy of a one stop strategy, is currently slowest as he aims to get up to speed after missing the morning session. |
| 14:25:15
| Webber moves fourth fastest in his Red Bull Renault, just behind team-mate Coulthard. |
| 14:25:44
| Massa rolls out of the pit lane in his Ferrari |
| 14:27:49
| Massa is on his first timed lap and should move up the order |
| 14:28:38
| Move up the order he does as Massa moves fastest, but he is actually on the soft tyre which is worth in the region of half a second a lap. |
| 14:29:59
| Fisichella has moves up to sixth in his Renault. Alonso is back out. |
| 14:32:13
| Kovalainen moves seventh fastest. |
| 14:33:18
| The fastest four are all on track as is Raikkonen who has been bumped down the order. |
| 14:34:36
| Tonio Liuzzi moves seventh fastest in his Toro Rosso, between the Renault duo. |
| 14:35:35
| Raikkonen moves up to fifth in his Ferrari. |
| 14:37:10
| Alonso, third, heads back to the pits. |
| 14:37:40
| The Super Aguri Honda duo are slowest at the moment. Both Sato and Davidson on track now looking to move up the order. |
| 14:38:51
| Davidson moves ahead of the Spyker duo and Wurz. |
| 14:39:23
| Massa remains fastest but he set that time on the soft tyres. |
| 14:40:37
| The drivers that are on track are all on long runs to evalaute the tyres. No one improving their own lap times. |
| 14:41:45
| Sato was unable to improve on that run and returns to the pit slowest of all. Sato scored his one and only career podium at this circuit a few years ago for BAR Honda. |
| 14:43:19
| Liuzzi does improve and moves ahead of Fisichella. |
| 14:47:16
| Coulthard, Raikkonen, Fisichella and Kovalainen on track as Speed moves up to 11th in his Toro Rosso. |
| 14:48:16
| Nico Rosberg moves eighth in his Williams. Wurz remains 21st. |
| 14:49:03
| Another quick lap from Rosberg who is now up to fifth. |
| 14:52:09
| Massa and Alonso are back out for Ferrari and McLaren. |
| 14:53:02
| The Renault duo of Fisichella and Kovalainen are back out as Ralf Schumacher gains one position |
| 14:55:45
| No real changes at the head of the timesheet with 35 minutes remaining. |
| 14:56:11
| Nick Heidfeld moves fourth fastest in his BMW Sauber ahead of Coulthard and Rosberg. |
| 14:58:21
| Heidfeld runs off track at turn three and back on track without a problem. |
| 14:58:56
| Hamilton also has a minor trip across the grass at the same place. |
| 14:59:52
| The circuit is pretty busy now. Kovalainen and the Spyker duo remain in the pits. |
| 15:00:21
| Correction. Hamilton and Heidfeld went off at turn 11, not turn 3. |
| 15:01:02
| All of a sudden there is a lot of people going off. Now it is Barrichello at turn one. He continues. |
| 15:01:55
| Raikkonen improves and gains two positions to fourth. |
| 15:05:03
| 2.4s cover the entire field at the moment. It is traditionally close in terms of lap time at Indianapolis and with the frozen rev-restricted engines, they all have pretty much the same power. |
| 15:08:54
| The front runners are pitting. Massa and Raikkonen remain on track. Both have used the soft tyre in this session. Hamilton and Alonso have remained on the hard tyre. |
| 15:11:51
| Mark Webber has stopped on track, seems to be a mechanical issue. He was ninth fastest at the time in his Red Bull Renault. |
| 15:12:55
| Vettel improves his own lap time but remains in eighth position. |
| 15:16:21
| The McLaren and Ferrari drivers are in the pits. No one has opted to go for a fast lap time yet. Alonso's 1:11.925s lap this morning remains fastest by some margin at this stage. |
| 15:17:01
| Hamilton back out with 13 minutes remaining. |
| 15:17:17
| Alonso follows out of the pit lane. |
| 15:18:09
| Alex Wurz is back out in his Williams. He remains slowest at the moment. |
| 15:18:50
| Hamilton and Alonso both on fastest laps. |
| 15:19:36
| Hamilton moves fastest, what will Alonso do? |
| 15:20:00
| Alonso takes over at the head of the timesheets |
| 15:20:49
| Wurz moves up the order in his Williams and now the Spyker duo are slowest. |
| 15:23:29
| Massa, third, is on a fast lap in his F2007. Raikkonen is in the pits. |
| 15:24:01
| Massa doesn't improve and remains third fastest with three tenths covering the top three. |
| 15:25:48
| Fisichella and Kovalainen seem equally matched. They are both looking to improve as Anthont Davidson does improve in his Super Aguri as he moves ahead of the Renault duo. |
| 15:26:07
| Raikkonen is back out as Massa pits. |
| 15:26:56
| Kovalainen and Barrichello move eighth and ninth fastest. |
| 15:27:17
| Three minutes remain and only Schumacher is in the pits. |
| 15:28:06
| Raikkonen improves by a few tenths but remains fourth fastest. |
| 15:30:06
| Schumacher is back out for one last lap. |
| 15:30:14
| The chequered flag is out. |
| 15:31:28
| Alonso sets the pace once again today from McLaren Mercedes team-mate Hamilton and the Ferrari duo of Massa and Raikkonen. Heidfeld is fifth ahead of Coulthard, Rosberg and Kovalainen. |
