Martin, who arrives in Japan only 13 points behind fellow Ducati man Francesco Bagnaia, topped the timesheets with a best effort of 1m45.192s, which was enough to top the session by 0.138s from Augusto Fernandez.
That came at the end of a run of three successive improvements for the Pramac rider, who knocked Bagnaia off the head of the standings with a 1m45.509s before finding just over three tenths over his next two laps.
