The Porsche driver decisively took the lead of the race at first of lap 21 following a quick security automobile to retrieve particles and managed his remaining power over the remaining six laps to safe his second win of the weekend on the Portland Worldwide Raceway.
Having been gifted Saturday’s win after a five-second penalty was handed to on-the-road winner Mitch Evans, there was little doubt of da Costa’s win on Sunday regardless of late stress from Robin Frijns.
Evans accomplished the rostrum to maneuver to inside simply 12 factors of Jaguar team-mate Cassidy, who after spinning out of the lead in Saturday’s race, failed to attain once more on Sunday after pitting for a brand new entrance wing.
Fellow title protagonist Pascal Wehrlein completed fourth minus his entrance wing after contact with Edoardo Mortara earlier in proceedings, and likewise now sits 12 factors behind Cassidy within the standings.
The Porsche driver’s entrance wing grew to become lodged below his automobile following the contact with Mortara earlier than flying off and into the trail of Sam Bird, with the McLaren driver then taking to the grass alongside the again straight – and the incident was famous by the stewards.
However with the offending bodywork gone, Wehrlein proceeded to hold on and took very important factors in his hunt for a maiden Method E title.
His margin to Cassidy was diminished after the Jaguar driver was compelled to pit following a collision into Flip 1 on lap 13 that concerned reigning champion Jake Dennis, Nyck de Vries and Caio Collet, all of whom suffered injury to their entrance wings within the concertina have an effect on.
With particles littered across the circuit the security automobile was ultimately deployed on lap 18, providing a lifeline to the likes of Cassidy and Dennis, who have been in a position to meet up with the again of the pack.
After simply two laps below warning, racing resumed with Frijns on the head of the sphere adopted by da Costa, Wehrlein and polesitter Jean-Eric Vergne.
Evans occupied fifth however with nonetheless one Assault Mode left to take was at all times going to be at a drawback because the tempo of the race as soon as racing resumed ramped up significantly.
As da Costa instantly took a lead he wasn’t to lose into Flip 1 on the restart, Evans took his second activation and dropped to seventh earlier than charging again via the pack.
He demoted Wehrlein for third into Flip 1 on lap 23 and repeated the identical transfer on Frijns a tour later through the assistance of his additional enhance of energy.
However with that depleted he was unable to problem da Costa over the remaining laps and fell into the clutches of Frijns, the Envision driver transferring again into second into Flip 1 on the penultimate lap and with it securing back-to-back podiums in America this weekend.
Regardless of having significantly extra power than these forward, the elevated tempo of the race after the security automobile meant Cassidy was by no means in a position to utilise his benefit and will solely climb to thirteenth.
It means Cassidy leaves the Portland double-header pointless and with a considerably diminished margin with simply two races in London remaining this season.