Fabio Quartararo makes a move. He's up to 5th place and top Yamaha, although +0.750s from Acosta.
The latest top 10: Acosta (top KTM), Bezzecchi (top Aprilia), Binder, M.Marquez (top Ducati), Ogura, Miller (top Yamaha), A.Marquez, Morbidelli, Zarco (top Honda), Marini.
Binder strikes back with P3, 0.266s behind team-mate Acosta. Bezzecchi is now splitting the KTMs.
Speaking of KTM, it's been a better start for new Tech3 riders Maverick Vinales and Enea Bastianini, who are 10th and 11th at present.
Acosta's factory team-mate Brad Binder is 16th.
Acosta is the only rider so far in the 1m 29s but there's still some way to go with the official pole record a 1m 28.700s by Francesco Bagnaia.
This is quite a run by Pedro Acosta, who improves yet again, but Bezzecchi also trims his best to stay 0.3s behind the KTM.
Marc Marquez returns to the track, just as he is bumped to third on the timesheets by Aprilia's Marco Bezzecchi.
Acosta isn't done, he sets four fastest sectors to pull 0.342s clear of Marquez on his next lap.
But KTM's Pedro Acosta does even better and topples Marquez from P1 by 0.132s on his 22nd lap of the day.
While we were sorting those photos, Trackhouse rookie Ai Ogura shot up to second place, 0.209s behind Marc Marquez.
A few photos from this morning at Buriram...
![Jack Miller, 2025 Buriram MotoGP Test](https://cdn.crash.net/2025-02/GnG_1202821_HiRes.jpg?width=400)
Jack Miller, 2025 Buriram test
![Raul Fernandez back on track after hand surgery, 2025 Buriram MotoGP test](https://cdn.crash.net/2025-02/GnG_1202803_HiRes.jpg?width=400)
Raul Fernandez back on track after hand surgery, Buriram test
![Johann Zarco, Buriram test](https://cdn.crash.net/2025-02/GnG_1202791_HiRes.jpg?width=400)
Johann Zarco, Buriram test
![Pedro Acosta, Buriram test](https://cdn.crash.net/2025-02/GnG_1202760_HiRes.jpg?width=400)
Pedro Acosta pulls in, Buriram test
![Marco Bezzecchi, 2025 Buriram test](https://cdn.crash.net/2025-02/GnG_1202741_HiRes.jpg?width=400)
Marco Bezzecchi runs off track, Buriram test
![Marc Marquez, Buriram test](https://cdn.crash.net/2025-02/GnG_1202712_HiRes.jpg?width=400)
Marc Marquez fastest after the opening hour at the Buriram test.
Alex Rins has put Yamaha into the top ten, in 9th, 0.997s behind Marc Marquez's Ducati.
Monster team-mate Fabio Quartararo is 13th, with Pramac riders Jack Miller and Miguel Oliveira 14th and 20th respectively.
Raul Fernandez continues to make up for lost time at Sepang, he's now in 11th place for Trackhouse, 1.044s behind Marc Marquez.
Marco Bezzecchi sets a personal best in sector 1, then the best of the morning in sector 2, but the lap time slips away and he remains second to Marquez.
Alex Marquez, fastest at November's Barcelona test and then last week at Sepang, rises to third place for Gresini. +0.448s from brother Marc.
Approaching the end of the opening hour and the top rider from each manufacturer is:
Marc Marquez (Ducati) 1st
Marco Bezzecchi (Aprilia) 2nd
Johann Zarco (Honda) 3rd
Pedro Acosta (KTM) 5th
Alex Rins (Yamaha) 11th
After the highs of Sepang, where the Yamaha riders had the benefit of the Shakedown, it's been a slower start for the M1s at Buriram. But let's see how they improve.
45mins gone and there's a lull in the track action with only Alex Rins, Fermin Aldeguer and Lorenzo Savadori not back in the pits.
Ai Ogura is the top rookie so far, in 15th.
Aprilia's Marco Bezzecchi reduces Marc Marquez's advantage to 0.359s.
Meanwhile, Raul Fernandez is up to 14th (+1.388s), an impressive effort after hand surgery just one week ago.
The top ten: Marc Marquez, Johann Zarco, Luca Marini, Alex Marquez, Franco Morbidelli, Marco Bezzecchi, Pedro Acosta, Francesco Bagnaia, Brad Binder, Maverick Vinales.
Johann Zarco makes it two Hondas in the top 3 by splitting Marc Marquez and Luca Marini at the top.
35mins gone and Somkiat Chantra heads out onto a track where he will make his home MotoGP race debut on March 2.
Marc Marquez pits after his opening six-lap run.
Johann Zarco and the injured Raul Fernandez are now on track, meaning only local star Somkiat Chantra is yet to start testing,