Acosta down to a 1:38.012 to go fastest, but he's been beaten by Aldeguer - 1:37.793. Fastest lap of the day for the rookie.
Bezzecchi up to ninth with his latest lap but he's losing 0.3 or 0.4 in the third split and a further 0.2 or 0.3 in the final split.
Aldeguer was on course for another improvement but he ran through the chicane at turns 15 & 16.
Acosta improves, 1:38.126 to go third - soft rear tyre for him but 13 laps on it.
Bagnaia, down in 12th, runs on at turn one moments before Aldeguer goes to within 0.008s of Marquez. Runs on at the end of the front straight as well, the Spaniard.
A lot of race pace running going on now as riders are either on or heading out for their second runs.
Aldeguer, on a fresh rear tyre, has moved up to second.
Two crashes for Morbidelli this morning and he's just run on into turn five. No harm done but that's three big mistakes from Morbidelli on day one.
1:38.041 now for Marquez.
He leads from Aldeguer and Di Giannantonio, but the closest rider to Marquez who is also on a medium rear tyre at the moment is Alex Marquez in sixth, almost 0.4s behind the points leader.
Bagnaia improves again, goes back up to ninth on a 1:38.776. Almost all of his half-second time loss is in the final sector.
Shortly after, Marc Marquez has resumed the top spot with a 1:38.215.
Medium front, soft rear for Bagnaia on that lap; Martin just used the same combination to go second.
Di Giannantonio now fastest on that tyre combination as well - 1:38.245.
Bagnaia struggled this morning, only 15th-fastest.
Down in 14th until his most recent PB in this session, but he's just popped up to 9th.
Marc Marquez now fastest on 1:38.496.
Aldeguer has now gone fastest soon after Mir. Acosta also on a good lap. Times scrolling early on here.
Joan Mir now fastest on a 1:38.703. Marini has a new chassis from HRC but Mir is still with the older version on both of his bike.
Acosta runs on at turn 15 while trailing Bezzecchi, who is stuck up behind Oliveira.
Almost everyone on medium-compound front tyre to start this session, only Pol Espargaro differing there with a soft front.
About a 50/50 split on rear tyres between the soft and medium.
Luca Marini with the early benchmark in Practice at a 1:40.231.
Pit lane is open in Hungary and we are underway for Practice at Balaton Park.
Marc Marquez was 0.277s clear of Pol Espargaro this morning, but the KTM rider was on a fresh tyre at the end of the session. A more representative gap was to Pedro Acosta in third which stood at 0.570s.
Marquez is sure to find some improvement this afternoon, but surely so will the others. The question is can the lap time delta to the championship leader be closed in this second practice?
For reference, Marquez's time from this morning was a 1:37.956 - the first 1:37 to be set at the Balaton Park circuit by a motorcycle.
Times haven't improved too much this afternoon in the Moto3 and Moto2 classes.
About 0.6s of improvement for Max Quiles this afternoon compared to Guido Pini's best in Moto3 FP1.
Diogo Moreira only a tenth faster in Moto2 PR than Manuel Gonzalez was this morning.
So, perhaps not a lot of imrpovement to come in MotoGP, but we'll see. Practice now only 10 minutes away.
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We are 23 minutes away from the second practice session of Friday afternoon.
It's Marc Marquez who ends FP1 fastest in Balaton.
Pol Espargaro second from Acosta.
Marini ends up fourth from Alex Marquez and Bezzecchi.
Morbidelli, Bastianini, Aldeguer, and Martin round out the top-10.
Late crash for Miller. He's up and okay but he's ripped the fairing off the left side of the bike. P13 in FP1 for Miller.