Repsol Honda's Marc Marquez made his customary flying start as the MotoGP world championship leader topped the free practice times at Aragon.

Marquez dipped under Casey Stoner's 2011 circuit race lap record with a time of 1m 48.987s to head off Stefan Bradl on the satellite LCR Honda and team-mate Dani Pedrosa.

The series rookie is aiming to prevent title rival Jorge Lorenzo from making it three wins on the trot this weekend and managed to emerge on top following FP2 after Lorenzo had headed the first practice session on his Yamaha.

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"Today, I didn't feel as good as I did in the test that we did here after the Barcelona GP, as there was less grip in these two practice sessions," said Marquez, who leads the title race by 34 points with five rounds remaining.

"Anyway, it's the same for everyone. In general the feeling that we have is pretty good and I worked on various things with the bike today.

"However, we can still improve our set-up. We hope to take that step forward tomorrow and we shall see if the grip level improves, as that would make things so much easier for everyone."

Marquez's fastest lap was 0.132s quicker than Bradl, with Pedrosa a further 0.135s behind in third and Lorenzo fourth.

Honda dominated on the opening day, filling four of the top five positions, with Alvaro Bautista on the Gresini Honda finishing fifth behind top Yamaha rider Lorenzo.