Martin set a time of 1m31.811s on his Pramac Ducati with just 40 seconds left on the clock, taking the top spot by 0.102s from long-time pacesetter Vinales.
Vinales held the top spot for almost the entire 45-minute session at the Mandalika circuit and managed to find over a tenth on his final effort, but ultimately finished second ahead of his team-mate Espargaro.
