Marc Marquez set a blistering pace in opening practice for MotoGP's Aragon Grand Prix, going 1.6 seconds faster than his nearest rival Maverick Vinales.
Factory Honda rider Marquez quickly put himself 1.1s up on the field with a benchmark of 1m48.771s early on in the 45-minute Friday morning session, before working his way down to a 1m48.712s and then a 1m48.487s.
That was the quickest time until the closing minutes, when the reigning champion equipped a soft rear tyre to fire in a 1m47.030s - going two seconds faster than anyone else.
Marquez subsequently made one final improvement, posting a 1m46.689s to eclipse last year's pole position time set by Jorge Lorenzo and coming within two tenths of the all-time record Marquez himself set back in 2015.
Just one rider was able to come within two seconds of Marquez's fastest time, Yamaha's Vinales, who ended up 1.617s adrift of the pace with his final flyer.
Misano runner-up Fabio Quartararo was next on the Petronas SRT Yamaha, 2.001s slower than Marquez, and 0.019s ahead of Ducati rider Andrea Dovizioso.
Jack Miller (Pramac Ducati) and Joan Mir (Suzuki) set identical times to end up fifth and sixth, Miller's time being set first, ahead of Danilo Petrucci's Ducati.
The top 10 was completed by Pol Espargaro on the best of the KTMs, Franco Morbidelli on the second SRT Yamaha and Takaaki Nakagami's LCR Honda.
Alex Rins was 12th-fastest on the second Suzuki, the early part of his session having been disrupted by a mechanical problem that required him to pull off the track.
Valentino Rossi endured a low-key start to the weekend in 17th place, over three seconds off the pace, while Mika Kallio (pictured above) began his tenure as Johann Zarco's replacement at KTM in 19th.
Lorenzo was slowest of all in 23rd on the second of the works Hondas, four seconds off the pace and behind Aprilia wildcard Bradley Smith.
Practice one times
|3||Fabio Quartararo||Petronas Yamaha||Yamaha||1m48.870s||2.001s||19|
|5||Jack Miller||Pramac Ducati||Ducati||1m49.101s||2.232s||18|
|9||Franco Morbidelli||Petronas Yamaha||Yamaha||1m49.304s||2.435s||19|
|10||Takaaki Nakagami||LCR Honda||Honda||1m49.443s||2.574s||18|
|11||Miguel Oliveira||Tech3 KTM||KTM||1m49.445s||2.576s||17|
|14||Tito Rabat||Avintia Ducati||Ducati||1m49.607s||2.738s||18|
|15||Cal Crutchlow||LCR Honda||Honda||1m49.709s||2.840s||18|
|18||Francesco Bagnaia||Pramac Ducati||Ducati||1m50.122s||3.253s||15|
|20||Karel Abraham||Avintia Ducati||Ducati||1m50.155s||3.286s||16|
|21||Hafizh Syahrin||Tech3 KTM||KTM||1m50.418s||3.549s||17|