Citroen took its first Formula E victory in only the second race of its programme, thanks to a masterclass from Nick Cassidy at Mexico City.
Cassidy - who'd joined the former Maserati MSG team from Jaguar in the off-season - qualified only 13th and spent the first half of the race still outside the top 10.
But having saved ample energy, he took a six-minute attack mode soon after a lengthy safety car to retrieve Nyck de Vries' stranded Mahindra and surged through the field to take the lead.
Though Cassidy spent the final laps with a growing queue of cars behind him, many of them still using attack mode after he'd run out, he was able to fend off all his pursuers and win by six tenths of a second over Mahindra's Edoardo Mortara.
Reigning champion Oliver Rowland recovered from a trip over the grass in a traffic jam during his first attack mode to come back from 12th to third, sealing his podium with an opportunistic move on round one winner Jake Dennis's Andretti Porsche, which ran out of energy on the line and fell to fifth behind Taylor Barnard.
Barnard led the early running, having taken pole before losing his lap to a track limits infringement but then instantly gained first place in the race when polesitter Sebastien Buemi outbraked himself trying to defend against the DS Penske and went down the Turn 1 escape road.
A well-timed first attack mode helped Buemi come back from last to sixth before he had to pit with a puncture.
Porsche has often dominated Mexico City but its 2021 and '23 race winner here Pascal Wehrlein only qualified 11th. He got right the way through to the lead by taking a first attack mode much earlier than his rivals but couldn't sustain it and finished sixth.
Rookie Pepe Marti had substantial penalties to serve after his huge crash under yellow in the Sao Paulo opener last month, but still finished seventh having saved energy hugely in the hope of gaining under a late safety car - which is exactly what unfolded.
His Cupra Kiro team-mate Dan Ticktum was collected in a tangle between Antonio Felix da Costa and Maximilian Guenther.
Results
1 Nick Cassidy (Citroen)
2 Edoardo Mortara (Mahindra) +0.651s
3 Oliver Rowland (Nissan) +0.945s
4 Taylor Barnard (DS Penske) +1.436s
5 Jake Dennis (Andretti) +1.647s
6 Pascal Wehrlein (Porsche) +1.936s
7 Pepe Marti (Cupra Kiro) +3.894s
8 Jean-Eric Vergne (Citroen) +9.493s
9 Nico Mueller (Porsche) +5.143s
10 Norman Nato (Nissan) +5.843s
11 Mitch Evans (Jaguar) +6.168s
12 Maximilian Guenther (DS Penske) +9.113s
13 Lucas di Grassi (Lola Yamaha Abt) +10.370s
14 Joel Eriksson (Envision) +10.614s
15 Felipe Drugovich (Andretti) +13.200s
16 Zane Maloney (Lola Yamaha Abt) +27.458s
17 Sebastien Buemi (Envision) +1m00.202s
DNF Dan Ticktum (Cupra Kiro)
DNF Antonio Felix da Costa (Jaguar)
DNF Nyck de Vries (Mahindra)
