Ending the day on top of the pile, Fabio Quartararo (Petronas Yamaha SRT) was just ahead of Maverick Viñales (Monster Energy Yamaha MotoGP), whilst Franco Morbidelli (Petronas Yamaha SRT) made it a Yamaha 1-2-3.
Testing a new carbon swingarm along with chassis parts, Quartararo crashed at speed at the infamous Turn 10.
Viñales was frequenting the top of the timesheets throughout the opening day of testing for 2020, finishing just over a tenth-and-a-half behind Quartararo.
Two places further back was teammate Aleix Espargaro, whilst test rider Bradley Smith was up 20th and within two seconds of Quartararo at the top.
