Ducati's Jorge Lorenzo matched Maverick Vinales' 2017 Aragon pole time during testing at the Spanish circuit.
The Spaniard, who was on track with Andrea Dovizioso plus the Suzuki, Pramac Ducati and KTM teams, reportedly set a 1'47.6s lap - Vinales record is 1'47.635 - while Dovizoso was a further four-tenths in arrears.
No times for the rest of the participants were forthcoming.