After going unbeaten on a single lap all weekend, Gunther once again emerged as the fastest driver of all in Sunday qualifying, posting a stellar lap of 1:07.753, which allowed him to defeat Dennis of over half a second in the final.
Gunther was quicker than Dennis from the start of their duel, immediately establishing a lead of 0.134s before steadily increasing the gap over the rest of the lap.
Midway through the central sector, Gunther’s time was already 0.479s faster than Dennis, and he finally took his second pole of the Jakarta weekend – and of his FE career – by a surprising lead of more than half a second.
The German driver had already won the Group B session which allowed him to progress to the dueling stage, where he further increased his pace to become the first driver to break the one minute and eight second barrier this weekend.
This allowed him to easily beat DS Penske’s Stoffel Vandoorne in the semi-finals, where he bested teammate Edoardo Mortara by 0.134s to advance to the final.
Meanwhile, Dennis made it to the final after taking a win over Jaguar’s Mitch Evans in the semi-final by a thousandth. The British driver had built up a delay of 0.138s from Evans in the central part of the track, but he overturned the deficit with an incredible final sector to secure a place on the front row.
Dennis, who had previously been the fastest driver in Group A, also prevailed in the quarter-finals, edging McLaren’s Jake Hughes by over six-tenths in what was the closest duel of the day.
Evans will start from third position on the grid, behind poleman Gunther and Dennis, and will be in an ideal position to bounce back from Saturday’s defeat, which left him 34 points off the championship lead.
Mortara will line up fourth in the second of the two Maseratis, while Vandoorne will start fifth in DS Penske.
Saturday’s winner and Porsche driver Pascal Wehrlein will start from sixth position, having lost to Mortara in the semi-final, while Nissan’s Sacha Fenestraz and McLaren’s Jake Hughes will share the fourth row.
DS Penske’s Jean-Eric Vergne, who lost a place in the duels by just a thousandth to his team-mate Vandoorne, will line up off the grid.
Vergne will be joined on the fifth row by championship leader Nick Cassidy (Envision), who was eliminated again in the group stages and will have to start four places behind his rival Wehrlein.
Porsche’s Antonio Felix da Costa was no further than eleventh. Jaguar’s Sam Bird struggled even more in qualifying, finishing 14th, behind Nissan’s Norman Nato and the second Envision car of Sebastien Buemi.