Edoardo Mortara played his use of Attack Mode to perfection to seal his first win of the season in Mexico at Puebla.
The Rokit Venturi racer started from third on the grid, and got a good enough start to jump Pascal Wehrlein for second.
Mortara timed his use of Attack Mode perfectly, so he could jump pole sitter Oliver Rowland and came out in the lead and could build his lead with an extra 35kw of power.
Mortara would come under some late race pressure from Wehrlein, but the Porsche driver struggled with his tyres in the final stages of the race which allowed Mortara to hold off the German driver.
Wehrlein claimed second – but is under investigation again for suspected maximum power over use – despite appearing to lose the strategy battle with Rowland early on.
The race start was fairly quiet until the field got to Turn 4, where Stoffel Vandoorne would lose part of his right-front wheel cover in a collision that involved four cars.
Championship leader Robin Frijns, who started down in 21st, began the trend of taking Attack Mode early.
Oliver Rowland took one after another from just four laps in, however it proved to be his downfall when Mortara eventually got past.
Rowland then picked up damage after hitting the wall at Turn 7 which left him vulnerable to the Envision Virgin Racing driver Nick Cassidy, who leapt by a handful of laps from home for the Kiwi to earn a first Formula E podium.
Rowland claimed fourth despite hitting the wall, and was unable to capitalise on his aggressive Attack Mode strategy
The BMW Andretti contingent was led by Jake Dennis in fifth, the rookie coming out on top of a scrappy battle for points ahead of Alexander Lynn.
Maximilian Guenther secured seventh for BMW ahead of double champion Jean-Eric Vergne.
The DS Techeetah racer looked sound in fourth for much of the duration but spun at Turn 9 as he continued to use the regen braking paddle past the apex and unsettled the car.
Mitch Evans ran to ninth for Jaguar Racing and Saturday runner-up Rene Rast completed a remarkable climb from last to claim a point in 10th for Audi.