Ai Ogura goes up to second on new medium tyres.
Alex Marquez has gone down at Turn 1. He's ok.
Bezzecchi improves to second, but that's a decent lap from Bagnaia given it was done on a medium rear compared to the soft on the Aprilia.
We've already got a few riders out on soft rubber. That's a smart strategy, given how many crashes we've seen already and how those could potentially wreck your weekend.
Bezzecchi is one of those riders and goes up to third with a 2m02.351s.
It's clear that grip is at a bit of a premium this session because Bezzecchi had a big moment going through the fast Turns 16/17/18 right-handers on the rear.
Toprak Razgatlioglu has had a tip-off at Turn 11, but is back up and going again.
Great mates (and future team-mates?) Marco Bezzecchi and Pecco Bagnaia share a cheeky moment in pitlane a few moments ago 😂
Top 10 after 20 minutes
- Pecco Bagnaia
- Pedro Acosta
- Alex Marquez
- Luca Marini
- Johann Zarco
- Marc Marquez
- Raul Fernandez
- Jorge Martin
- Ai Ogura
- Joan Mir
Marquez now has a legal lap of 2m02.558s, which puts him up to sixth, as Ducati team-mare Pecco Bagnaia continues to lead.
All of these yellow flags have been quite disruptive. Marc Marquez doesn't have an official lap on the board yet because they've all been scrubbed.
Ai Ogura is now under investigation for possibly crashing under yellow flags.
And Ai Ogura has gone down now, as well. He went down at Turn 18, where Acosta slid off just seconds earlier.
Pedro Acosta has now gone down!
Morbidelli is up and walking away now. But that's four crashes inside the first 10 minutes.
Franco Morbidelli has had a crash at Turn 1 and looks in a bit of discomfort.
Pecco Bagnaia is having a good start to this session. He's taken over top spot now on the Ducati with a 2m02.191s.
DiGia has gotten back to his VR46 garage. Not ideal start to his race preparation, particularly given the pace he showed this morning and his past form at this track.
Track temp is touching 50C now, so it's little wonder we're seeing more crashes early in this session.
Quite a few laps already scrubbed for yellow flags, which could make later on interesting.
Meanwhile, his KTM stablemate Pedro Acosta has gone top with a 2m02.310s.
Enea Bastianini has now gone down at Turn 12.
Fabio Di Giannantonio and Jorge Martin have had separate crashes.
DiGia went down at Turn 11, while Martin went down at Turn 12. Martin was lucky not to wipe Brad Binder out there!
Acosta has really been embracing Texan culture.
Pitlane is open as Practice begins.
Once again, everyone has headed out on track.
Practice is now just 10 minutes away.
Top 10 at the end of this session will progress directly into Q2.
The top 10 at the end of FP1 was:
| Pos | Rider | Nat | Team | Time/Diff | Lap | Max |
| 1 | Pedro Acosta | SPA | Red Bull KTM (RC16) | 2'01.715s | 14/16 | 338k |
| 2 | Fabio Di Giannantonio | ITA | Pertamina VR46 Ducati (GP26) | +0.103s | 14/18 | 342k |
| 3 | Jorge Martin | SPA | Aprilia Racing (RS-GP26) | +0.221s | 13/17 | 340k |
| 4 | Marc Marquez | SPA | Ducati Lenovo (GP26) | +0.378s | 8/9 | 342k |
| 5 | Raul Fernandez | SPA | Trackhouse Aprilia (RS-GP26) | +0.495s | 12/17 | 337k |
| 6 | Alex Marquez | SPA | BK8 Gresini Ducati (GP26) | +0.589s | 13/16 | 339k |
| 7 | Luca Marini | ITA | Honda HRC Castrol (RC213V) | +0.650s | 14/18 | 339k |
| 8 | Ai Ogura | JPN | Trackhouse Aprilia (RS-GP26) | +0.673s | 14/18 | 340k |
| 9 | Marco Bezzecchi | ITA | Aprilia Racing (RS-GP26) | +0.710s | 16/19 | 341k |
| 10 | Franco Morbidelli | ITA | Pertamina VR46 Ducati (GP25) | +0.755s | 16/17 | 338k |
Maverick Vinales has withdrawn from the remainder of the US MotoGP weekend due to pain in his shoulder.
He is due to have surgery early next week.

