The Andretti Autosport driver had constructed up a margin of three tenths over the opening two sectors within the last duel and posted a 1m37.986s.
Cassidy, who completed second in Saturday’s opening Rome E-Prix however took the championship lead from Dennis consequently, put in a powerful last sector to slash the margin however fell 0.071s brief on the line.
Dennis additionally receives three factors for his pole place, which strikes him to inside two factors of Envision Racing’s Cassidy within the standings, however the end result stays provisional because the Briton is underneath investigation for an impeding incident in his qualifying group.
Mitch Evans, victor in Saturday’s Rome E-Prix which propelled him into title competition, was lastly crushed this weekend as championship rival Cassidy bought the higher of his fellow Kiwi regardless of a sketchy second by means of Flip 7 as each set scrappy semi-final laps.
Simply over a tenth separated Dennis and Nissan’s Norman Nato within the second semi-final duel because the Briton’s lap, a 1m38.087s, was simply 0.031s slower than Cassidy’s time in the identical component of qualifying.
Two robust last sectors ensured Dennis of a semi-final spot after ending practically half a second forward of Maximilian Guenther, the Maserati driver additionally underneath investigation after the session for not slowing down by means of a yellow flag zone in his qualifying group.
The quickest time by means of all three sectors meant Cassidy comfortably beat NIO 333’s Dan Ticktum within the opening quarter-final duel by greater than a second with a 1m37.536s.
Nato progressed by means of his quarter-final duel in opposition to Sebastien Buemi after the Envision driver made gentle head-on contact with the barrier at Flip 7 having been fractionally faster within the opening sector.
In a repeat of the ultimate duel on Saturday, Evans bested Jaguar team-mate Sam Hen however solely after the Briton backed off within the last sector.
The pair had been virtually equivalent on occasions by means of the opening two sectors however Hen, who triggered the multi-car crash in Saturday’s race and was in a newly-rebuilt automotive, backed off earlier than the road to assist Evans’ championship cost.
Dennis set two laps adequate to complete quickest within the second qualifying group, his last effort leaving him on a 1m38.214s and 0.257s away from Buemi, as Nato and Guenther accomplished the highest 4.
McLaren’s Jake Hughes, who needed to sit out Saturday’s race as a consequence of a heavy crash in qualifying, went into the run-off space at Flip 7 on his last run which meant he completed sixth, simply forward of team-mate Rene Rast.
Each completed instantly in entrance of Pascal Wehrlein, the Porsche driver set to start out additional down the grid in contrast together with his title rivals after a troublesome weekend up to now for the German.
Hen put in a powerful last lap within the opening qualifying group to move the occasions with a 1m38.434s, 0.113s away from Cassidy who had topped the group after the opening runs.
Ticktum completed third from Evans, with the highest 4 lined by lower than three tenths.
Porsche’s Antonio Felix da Costa missed out in fifth, greater than half a second behind Hen’s greatest lap, forward of fellow Method E champions Jean-Eric Vergne (DS Penske) and Lucas di Grassi (Mahindra).
Nissan’s Sacha Fenestraz, who had topped his qualifying group on Saturday and led for a interval of the race, did not make it out as a consequence of a battery change.
