Armed with successfully an all-new automobile after his Flip 6 crash in the deluge that ended Saturday’s race prematurely, Cassidy labored his option to the ultimate as soon as extra to tackle da Costa – in a battle between System E’s most up-to-date polesitters.
Within the opening corners, the New Zealander bagged a wholesome benefit, which translated to 0.09s in his favour by the tip of the primary sector.
That benefit grew with every sector, and thus handed Cassidy a session-best lap of 1m08.584s to clinch a clear sweep of poles in Brooklyn.
However after the session, Cassidy dropped to the underside of the timing boards with a 30-place grid penalty, having modified his battery pack and cooling amid the repairs to his automobile.
Cassidy had breezed previous Andre Lotterer to achieve the ultimate, following the German’s more and more scruffy lap, which featured a slide at Flip 6 that finally culminated in a 1.6s deficit to the Envision driver.
The semi-final between da Costa and Alexander Sims was altogether far nearer and, regardless of Sims’s lock-up into Flip 1, the Briton ended the primary sector fractionally forward.
Da Costa hit again to guide the second sector by a scant 0.003s, which means that the eventual 0.15s benefit that carried the DS Techeetah driver to the ultimate was all produced within the remaining sector.
Sims therefore begins Sunday’s race in second – after Cassidy’s penalty – via his 1m08.830s lap, as Lotterer was comparatively gradual with a 1m10.420s.
After topping his group, Sergio Sette Camara ran Lotterer shut of their quarter-final duel and had the higher hand by a fraction on the finish of sector 1, however Lotterer’s higher center sector gave the Porsche driver sufficient to get via on the Dragon Penske racer’s expense.
Cassidy made his well past Stoffel Vandoorne as they battled for a semi-finals place, choosing up an early benefit and letting it develop as Vandoorne took an excessive amount of kerb at Flip 12/13 to finish his hopes of creating it into the highest 4.
Da Costa was 0.002s behind Nyck de Vries on the finish of the primary sector, however the Dutchman then received a bit wayward on the Flip 6 kerb and shipped nearly two tenths to the Portuguese driver – which proved to be insurmountable by the tip.
However the largest shock of the quarter-finals was Sims’s victory over Mitch Evans of their duel, with the Mahindra driver’s first sector proving to be sufficient to maintain him forward regardless of the Kiwi going faster within the latter two sectors. The 2 had been cut up by simply 0.006s.
Alexander Sims, Mahindra Racing, Mahindra M7Electro
Photograph by: Simon Galloway / Motorsport Images
Sette Camara’s time was the most effective out of these eradicated, producing an eventual fourth-place grid slot for the race with Vandoorne, Evans and de Vries behind him.
For the second day in a row, championship chief Edoardo Mortara was unable to progress from the group stage – having been unable to set a lap inside the first six minutes of the session owing to brake-by-wire points.
Jean-Eric Vergne hit the wall on the exit of Flip 13 and thus ended his probabilities of development too, as Robin Frijns made an analogous error and couldn’t be part of team-mate Cassidy into the ultimate eight.
Practice leader Sam Bird additionally did not make the reduce, ending tenth within the group after having to evade Vergne on the shut of the session – which turned ninth after Pascal Wehrlein had his laps deleted for overusing energy.
Lucas di Grassi additionally had his finest two laptimes deleted for failing to respect the necessary minimal pit in/pit out time of 100 seconds – and thus had his headline time eliminated and was relegated to tenth in Group B.
This reinstated Lotterer into the highest 4, with Jake Dennis simply on the cusp whereas Antonio Giovinazzi grabbed sixth within the second group.
Following Cassidy’s demotion, Oliver Askew begins eighth forward of Avalanche Andretti team-mate Dennis, whereas Frijns heads Giovinazzi.