Martin has now won four sprint races on the bounce to head Bagnaia in the standings for the first time in 2023.
Ducati has also wrapped up the constructors’ championship for 2023 following Martin’s sprint victory.
The Spaniard beat poleman Luca Marini by 1.131 seconds having started sixth on the grid following a crash in qualifying, and now leads the championship by seven points.
A late error for Marini gifted Martin a comfortable margin to victory, while VR46 celebrated double podium success as Marco Bezzecchi joined his team-mate on the rostrum.
Both VR46 Ducati riders come to Indonesia after recent collarbone fractures, with Marini injuring himself in a collision with Bezzecchi in India, while the latter went under the surgeon’s knife last Monday after a crash during training.
Failing to exit Q1, erstwhile championship leader Bagnaia struggled to move forward in the sprint from 13th and could do no better than eighth courtesy of several errors for others.
Marini got the best launch off the front row at the start of the 13-lap contest to maintain pole into Turn 1, while Maverick Vinales on the Aprilia and Yamaha’s Fabio Quartararo slotted in behind.
Vinales immediately took the lead from Marini at Turn 2 and quickly broke away from the chasing pack.
A crash for Honda’s Marc Marquez on the opening lap pushed Bagnaia up to 11th come the end of the tour.
Martin assaulted the podium places at the start of lap two, sending his Pramac Ducati up the inside of Quartararo into Turn 1.
But he ran wide and let Quartararo back through, with the same thing happening moments later at Turn 10. Martin made the move stick at Turn 11.
Source: Autosport