Jack Miller set a new All Time Lap Record at Portimao, turning a best lap at 1:37.709 on his KTM.
Maverick Vinales was second-quickest at 1:37.746 on his Aprilia, and defending MotoGP World Champion Francesco Bagnaia was third-quickest at 1:37.856 on his Ducati.
Others included:
4. Luca Martini, Ducati, 1:37.899
5. Jorge Martin, Ducati, 1:37.991
6. Fabio Quartararo , Yamaha, 1:38.015
7. Johann Zarco, Ducati, 1:38.112
8. Marco Bezzecchi, Ducati, 1:38.158
9. Aleix Espargaro, Aprilia, 1:38.253
10. Enea Bastianini, Ducati, 1:38.256
11. Alex Marquez, Ducati, 1:38.385
12. Joan Mir, Honda, 1:38.394
13. Alex Rins, Honda, 1:38.416
14. Marc Marquez, Honda, 1:38.419
15. Takaaki Nakagami, Honda, 1:38.827
16. Augusto Fernandez, GasGas/KTM, 1:38.882
17. Raul Fernandez, Aprilia, 1:38.904
18. Brad Binder, KTM, 1:30.910
19. Miguel Oliveira, Aprilia, 1:38.958
20. Franco Morbidelli, Yamaha, 1:38.978
21. Fabio Di Giannantonio, Ducati, 1:39.421
22. Pol Espargaro, GasGas/KTM, 1:40.130