Evans had led four prior Monaco E-Prix without converting the win, and had made three prior visits to the podium - more than any other driver - this one at the jewel in motorsport's crown had to stick.
The pair hit the front - Evans from Cassidy - on Lap 11, jumping the DS PENSKE of Stoffel Vandoorne who had made it by polesitter and the race's initial leader Pascal Wehrlein (Porsche) in the early stages.
RESULTS: The 2024 Monaco E-Prix Round 8
From there, the team's strategy looked clear with Evans bolting to a three-second gap at the front and Cassidy holding station to back up the pack, allowing Evans to take ATTACK MODE and retain clear air in P1 - the duo navigating an early Virtual Safety Car for the recovery of Edo Mortara's Mahindra, which hit the wall in a big way at Swimming Pool.
On Lap 14 at just about the half way stage of the 31-lap encounter, Evans took his second 50kW ATTACK MODE boost, giving up the lead to Cassidy, while returning the favour to keep the pack at bay. The team's tactics working just as intended.
The Jaguars looked to be a couple of percent to the good on usable energy compared to the DS PENSKEs behind, while Evans held a 0.5% advantage over Cassidy. On Lap 17, Evans retook P1 from his teammate and from there, that was that - measured to perfection and a first Monaco win for both Evans and Jaguar TCS Racing - at last - and a one-two to boot, the team's second in Formula E.
Vandoorne and Vergne also played a strong team game, following the Jaguars home in third and fourth while Julius Baer Pole Position winner and standings leader Wehrlein came home an eventual fifth just ahead of a battling Oliver Rowland (Nissan) - the Yorkshireman with his hands full with the Porsches for much of the encounter; Antonio Felix da Costa following him across the line in seventh.
Sacha Fenestraz (Nissan), Maximilian Guenther (Maserati MSG Racing) and Norman Nato (Andretti) rounded out the points-paying positions and the top 10.
That leaves Wehrlein top of the standings on 102 points with an extended lead with Jake Dennis' battle through the pack into the points coming to an abrupt end in contact with Frijns in the tunnel. Cassidy sits second on 95 points, with Dennis six points further back, now third. Just 14 points split first and fourth in the Drivers' table.
Jaguar TCS Racing top the Teams' running on 172 points to TAG Heuer Porsche's 128.
Rounds 9 & 10 of Season 10 follow in Berlin on 11 & 12 May.
As it happened...
Wehrlein leapt away with a textbook launch to head Vandoorne and Cassidy through Sainte Devote, though by the end of Lap 1 Evans had made it past his Jaguar stablemate for third. Guenther followed in fourth, with Vergne rounding out the top six. Dennis was eager to make progress from a lowly 18th on the grid - squeezing Werhlein at the Nouvelle Chicane before sweeping by at Tabac. Come Lap 2, Andretti's reigning champion had made it to P14.
On Lap 3, Vergne was able to make a move stick on Wehrlein for fourth, late on the brakes into the Chicane. Meanwhile, on Lap 4, Wehrlein's teammate da Costa got caught in the melee at the Hairpin with an ERT clattering Buemi, which blocked the Porsche as the pack backed up. Wehrlein had ceded the lead to take his initial ATTACK MODE activation, with Vandoorne, Evans and Cassidy making it by the German.
Edo Mortara hit the wall in a big way a tour later. The Mahindra driver was squeezed out of position at the Chicane, before Ticktum drew alongside through Tabac. The Swiss-French-Italian wouldn't give the spot up easily, looking to hang on to the ERT around the outside of the entry to Swimming Pool but he caught a bucket of understeer and found the wall with some force. Thankfully, he was able to walk clear with the Virtual Safety Car picking the pack up, and cited technical issues for the shunt once out of the car.
The Green Flag was flown on Lap 8, with Vandoorne leading Evans, Cassidy, Vergne, Wehrlein, Guenther, Frijns, Sette Camara, Rowland and Dennis away. On Lap 10, Rowland made super use of ATTACK MODE - one of two mandatory 50kW boosts to take at a time of the drivers' choosing in the E-Prix - to jump from ninth to sixth. Out front, more action at the Hairpin saw the Jaguars jump leader Vandoorne - Evans leading from Cassidy.
Reigning champion Dennis was making great ground, ninth on Lap 10. However, his progress would come to a swift end in contact with Frijns in the Tunnel - an unusual accident but that turn tightens deceptively. A broken front wing required a pit-stop, demoting Dennis to the back of the pack.
Jaguar's strategy looked clear on Lap 11. Evans bolted to a three-second gap, with Cassidy sitting in and backing up the pack, allowing Evans to take ATTACK and extend his advantage to four seconds come Lap 12.
On Lap 14, just about the half way stage, Evans took his second 50kW boost, giving up the lead to Cassidy, while holding the pack back for his countryman to take his own ATTACK MODE boost without losing P1. The team's tactics working, as of then, perfectly.
On Lap 16, Vandoorne and Vergne looked to be up to a similar scheme - the pair working through their ATTACK MODE activations while looking to hold track position - third and fourth as it stood with Werhlein in waiting just behind the black and gold DS pairing.
Lap 17 saw Evans retake the lead as Cassidy took ATTACK, on the way down the hill from Casino Square and a lap later, Rowland and Guenther's squabble for sixth continued - the Yorkshireman taking the spot back at the Chicane with the Maserati MSG Racing driver skipping across the kerbs. Guenther seemed to be struggling from there, da Costa making it by to take seventh at Portier and Fenestraz following at the Nouvelle Chicane with Guenther again taking to the run off.
Da Costa made more progress on Lap 21, aggressively squeezing by Rowland for sixth at Mirabeau.
As the laps ticked down, the energy advantage was with the leader - some 0.5% up on Cassidy and a couple of percentage points of usable energy in-hand over the rest of the contenders. It looked serene out-front.
A late shunt for ABT CUPRA's Nico Mueller at Rascasse saw the Safety Car make an appearance, with a couple of Added Laps to come to take us to a total of 31 and the Green Flag flying again come Lap 27.
Jaguar had plenty in their pocket to hold off the DS' behind as Evans finally made it stick in Monaco, heading Cassidy home from Vandoorne and Vergne.