Marc Marquez is back on track for the closing minutes, but has now been pushed to 3rd behind Pedro Acosta and a surprise lap from home rookie star Ai Ogura (also on used tyres).
5mins to go and KTM's Pedro Acosta replaces Marc Marquez at the top of the final practice timesheets.
Photos of Marc Marquez getting frustrated with the Motegi marshals, who almost drop his GP25 as they try to retrieve it from the Turn 5 gravel in final practice.
Marquez takes over and pushes it out himself:



The top 13 riders are on the soft rear, with Raul Fernandez fastest of those on the medium rear ahead of KTM riders Brad Binder and Enea Bastianini.
Yamaha riders Alex Rins and Fabio Quartararo are only 21st and 22nd.
Francesco Bagnaia is now up to second place, just 0.017s behind Marquez.
15mins - Halfway:
- Marc Marquez
- Franco Morbidelli
- Francesco Bagnaia
- Marco Bezzecchi
- Takaaki Nakagami
- Luca Marini
- Alex Marquez
- Joan Mir
- Pedro Acosta
- Fermin Aldeguer
Marquez is still trying to drag his GP25 out of the gravel, and looks to be getting frustrated with the marshals, who almost dropped the bike.
It's not been an easy weekend for the soon-to-be nine-time world champion...
The #93 finally gets the bike going, off the track, and returns to the pits.
Crash for Marc Marquez. The world championship leader is unhurt and trying to restart his Ducati in the Turn 5 gravel. Marquez, who lost the front at low speed, is currently fastest but wants to get his bike back to the pits as soon as possible.
As expected, all riders are on the medium front tyre (used in both races last year), with most riders using the soft rear, the expected choice for this afternoon's Sprint.
Fabio di Giannantonio is the first faller of the day, at Turn 5. The VR46 rider is okay, but will miss out on vital race preparation.
The green lights are on and the 30-minute FP2 session begins.
Meanwhile, Saturday could be a make-or-break day for Francesco Bagnaia, who is reserving judgment on some promising Ducati changes from the Misano test until the end of Saturday.
Good morning and welcome to Crash.net's live coverage of Saturday at the Japanese MotoGP, where final practice is about to begin.
That will be immediately followed by Qualifying 1, featuring Alex Marquez, and then the Qualifying 2 pole position shootout.