Martin back out on track and up to eighth. He's half-a-tenth ahead of Bezzecchi now.
Mir was the latest rider into the 1m53s but he's had that lap cancelled for track limits.
Aldeguer and Fernandez have improved and are into the 1m53s now, still Marquez at the top by 0.294s over Fernandez though.
Bagnaia has become the second rider to lap in the 1m53s, but he's still 0.4s behind his team-mate.
Ogura up to third behind the factory Ducatis, but he's 0.3s behind Bagnaia.
Bezzecchi still down in eighth, Martin in 20th after his early issues.
Martin has pulled off track, looks like a technical problem for the 2024 champion. Not a great start to the day for him.
Looks like the bike cut out as he was practicing the long lap loop. He has to serve two in the race on Sunday as a result of the Balaton crash.
Marquez improves again at the top, he's 0.7s clear of the field now and still the only rider in the 1m53s.
Martin improves his time but only P14 and 1.3s off the pace. Fernandez currently the leading Aprilia in P6 but 0.7s off the pace.
Both factory riders of course have some degree of physical limitation this weekend after the Balaton crash. Bezzecchi yesterday noted that he hadn't been able to ride since Hungary, so today is his first time riding since the crash.
Vinales also back out on-track, his first lap is 2.9s off the pace. Moreira the only rider without a lap time now.
A lot of riders back in the pits now. Acosta one exception after his crash earlier and he's just gone fifth, albeit 0.7s off the pace.
Only the top eight at the moment within a second of Marquez.
Championship leader Bezzecchi P10 and +1.2s.
Marc Marquez the first rider into the 1m53s and over half-a-second clear of the field.
Pedro Acosta just heading back out of the pits on his spare bike.
Good start for Ducati. Top-four currently all on Desmosedici: Aldeguer ahead of Bagnaia, Di Giannantonio, and Marc Marquez.
Binder the leading non-Ducati in fifth. Decent start for Quartararo in P6 as well.
Moreira has also crashed. Turn eight for the Brazilian. It is exceptionally hot for an FP1 session, track temperature is already at 39C, so perhaps that is having an impact.
Already a crash early on here, Pedro Acosta has gone down at turn nine. Just lost the front as he came towards the exit.
Vinales has gone down as well. Not a great start for KTM.
Bezzecchi has also run off the track at the penultimate corner but hasn't gone down, just a run through the gravel. Bizarre start to this session.
Pit lane is open in Brno and we are underway for FP1.
Alex Marquez makes his return to MotoGP today after his Catalunya crash a month ago.
The Spaniard said yesterday that he remembers "everything" about the crash and that he felt it was important to try to return this weekend after a month away.
Full story here.

The incident at Balaton involving the two factory Aprilias leads to questions of a change of atmosphere between Marco Bezzecchi and Jorge Martin.
Bezzecchi yesterday said, simply, "no" in response to these suggestions, although his lack of any kind of elaboration perhaps draws more conclusions than the monosyllabic opinion of the Italian.
Full story here.

Since Balaton the subject of the cause of the turn one incidents has been central to MotoGP discourse.
Start devices have taken a degree of blame from many riders, but Marc Marquez said yesterday that he thinks the quantity of starts riders do in a weekend now means that incidents are more likely.
Full story here.

Welcome to live coverage of the Friday practice sessions from the 2026 Czech MotoGP. FP1 is due to start in around 45 minutes at 10:50 local time.

