Jack Miller goes second, just 0.191s behind Bagnaia...
2mins to go: There are red sectors showing for Miller, Binder, Marini and Oliveira.
Ducati looked like they were going to react, but change their mind. Bagnaia removes his helmet and watches the TV.
4mins to go and Bagnaia is still in the pits.
Ahead of the final Qualifying 1 run: Bagnaia, +0.421s di Giannantonio, +0.550s Miller, +0.598s Binder.
Then it's Aldeguer, Marini, Rins, Bastianini, Chantra, Savadori, Vinales and Oliveira.
Bagnaia and team manager Davide Tardozzi are deep in conversation in the Ducati pits, they must be deciding whether to go out again or not.
The cameras cut to Pedro Acosta, already in Qualifying 2, with an ice bag on top of his head. Temperatures are due to reach 38 degrees today.
Bagnaia looks safe, he's now 0.421s ahead of di Giannantonio. But will he head out for another run or hope he's done enough and save tyres for Qualifying 2?
Pramac Yamaha's Jack Miller and former KTM team-mate Brad Binder are closest to Bagnaia and Diggia.
Francesco Bagnaia and the injured Fabio di Giannantonio hold the early Qualifying 2 transfer places.
Now it's straight into qualifying, where Bagnaia needs to fight his way through Q1.
Bagnaia has been running the hard front and soft rear, while Morbidelli used a new front to go fastest.
Marc Marquez has now done well over a Sprint distance on the soft tyres, front and rear.
Franco Morbidelli, who will have a three-place grid penalty to serve on Sunday for holding up Bagnaia in Friday practice, now puts his VR46 machine on top.
It's now a Ducati Lenovo one-two with Marc Marquez ahead of team-mate Francesco Bagnaia. Could we see a duel between the multi-champions in this afternoon's Sprint?
Marc Marquez has a small scare with a twitch from his Ducati kicking his foot off on corner exit, but continues his run.
Michelin's Piero Taramasso tells Dorna Jack Appleyard that the two fronts and two rears are viable for the Sprint race.
Halfway through final practice and Francesco Bagnaia, who must fight his way through Qualifying 1 this morning, is on top by 0.101s from Alex Marquez with rookie Ai Ogura yet again impresssing in third.
Friday's fastest lap was a 1'29.020 by Alex Marquez, who now leads the timesheets.
Brother Marc is trying some 2025 aero this morning.
The half-hour final practice session is underway at Buriram.
Some news to start the day...
Thai MotoGP: Alex Rins punished for surprise technical infringement