Marquez is among the riders to try a bike swap after returning from the practice starts.
There's bright sunshine at the moment, but rain is forecast from Saturday.
Marquez immediately reaches for an energy gel after returning to the Ducati pits.
Marquez is among the riders to try a bike swap after returning from the practice starts.
There's bright sunshine at the moment, but rain is forecast from Saturday.
Marquez immediately reaches for an energy gel after returning to the Ducati pits.

Marc Marquez has the final word in FP1, setting the fastest lap time on old 19-lap medium tyres.
That's a warning shot to the Aprilias.
While Miller makes his way back, Raul Fernandez returns to P1.
Moments after setting the fastest time, Miller loses the front through the ultra fast Turn 1. Fortunately, he's okay.
That was a 150km/h fall. He's getting a lift back on a marshal's motorbike.
Home hero Jack Miller puts on some new medium tyres and goes fastest in the closing minutes!
More replays of Stoner corner and this time it's Marc Marquez drifting spectacularly.
Raul Fernandez, on new soft-medium tyres after his fall, edges ahead of Marco Bezzecchi.
Riders are all saving their hard fronts for now. We should see those this afternoon.
1. Marco Bezzecchi 1m 28.278s
2. Pedro Acosta +0.166s
3. Marc Marquez +0.174s
4. Jorge Martin +0.332s
5. Ai Ogura +0.342s
6. Fabio Quartararo +0.510s
7. Alex Marquez +0.516s
8. Fabio Di Giannantonio +0.674s
9. Johann Zarco +0.867s
10. Jack Miller +0.873s
11. Raul Fernandez +1.059s
12. Brad Binder +1.201s
13. Alex Rins +1.458s
14. Francesco Bagnaia +1.575s
15. Enea Bastianini +1.578s
16. Diogo Moreira +2.030s
17. Augusto Fernandez +2.234s
18. Maverick Viñales +2.429s
19. Franco Morbidelli +2.497s
20. Iker Lecuona +2.796s
21. Luca Marini +5.755s
Replays show Pedro Acosta sliding through Stoner corner. Acosta is now up to 2nd place for KTM, between Marco Bezzecchi and Marc Marquez.
Good news: Defending winner Raul Fernandez, who celebrates his birthday today, is heading back on track.
"Everything is OK," confirmed Trackhouse Aprilia team principal Davide Brivio.
Marc Marquez is losing out to Bezzecchi in the final sector, which includes the fast final corner.
Marquez and Ducati's reign doesn't last long; Bezzecchi strikes straight back.
Marc Marquez keeps everything on line next time around and goes to the top by 0.186s.
Marc Marquez runs wide at MG, after the steep drop down Lukey Heights. The reigning champion had been set to take P1 from Bezzecchi.
Paolo Bonora leaves the Aprilia pits after reading something on his phone. Let's hope it's not bad news about Fernandez's hand.
Fernandez arrives back in the paddock and is immediately greeted by MotoGP doctor Angel Charte.
Fernandez lowsided but then rolled through the gravel trap and into the tyre wall. His injured hand from Indonesia is the clear concern.
1. Marco Bezzecchi 1m 28.898s
2. Marc Marquez +0.022s
3. Jorge Martin +0.226s
4. Jack Miller +0.253s
5. Johann Zarco +0.427s
6. Raul Fernandez +0.439s
7. Pedro Acosta +0.450s
8. Ai Ogura +0.545s
9. Fabio Di Giannantonio +0.715s
10. Fabio Quartararo +0.772s
11. Alex Rins +0.838s
12. Brad Binder +1.244s
13. Enea Bastianini +1.336s
14. Diogo Moreira +1.410s
15. Alex Marquez +1.571s
16. Franco Morbidelli +1.877s
17. Maverick Viñales +1.941s
18. Augusto Fernandez +2.127s
19. Iker Lecuona +2.176s
20. Francesco Bagnaia +3.260s
21. Luca Marini +5.135s
Aprilia team manager Paolo Bonora states that there are no team orders this weekend, with all four riders told only to have 'respect' for their fellow RS-GP riders.
"At the moment we haven't defined anything regarding [team orders]," Bonora tells MotoGP pit lane reporter Jack Appleyard.
Now last year's winner Raul Fernandez has fallen, at turn 7, and immediately reaches for his injured hand.
Brad Binder has had a big engine failure on the main straight, pulling off with smoke billowing from his KTM.
Binder is low on engines after the earlier RC16 reliability issues, meaning he may have been using a high mileage powerplant for FP1.
Fermin Aldeguer's Gresini Ducati replacement Iker Lecuona suffers an early fall, he sends the GP25 bouncing off a tyre wall but walks away.
Marc Marquez, riding with his 'blue' helmet, splits the factory Aprilias with second place.
It's an Aprilia top three with Marco Bezzecchi, Jorge Martin and Raul Fernandez after the opening laps.
The RS-GP is tipped to be the bike to beat, at least in the dry.
More riders are on medium compound tyres front and rear for the start of FP1.
A few are on the soft front.
Last year saw the hard front favoured for the races, with the soft (Sprint) and medium (Grand Prix) rears.