Antonio Felix da Costa made it back-to-back wins at Portland - and three Formula E victories in a row - while the 2024 title fight was blown wide open as points leader Nick Cassidy failed to score for a second day in a row.

In what was an excellent second race of the Portland weekend for Porsche, da Costa's fourth victory of the season - which have all come in the last five races - was backed up by team-mate and title hopeful Pascal Wehrlein grinding out a fourth-place finish despite running without a front wing for more than two-thirds of the 27-lap race.

Though there were the anticipated wild swaps of position throughout the order in the opening laps, second-place starter da Costa was one of a handful of drivers who spent the majority of the race at the head of the order along with eventual runner-up Robin Frijns and polesitter Jean-Eric Vergne.

Envision driver Frijns was the leader when the safety car - deployed so debris from multiple collisions could be cleared - came in at the end of lap 20, but da Costa dived swiftly for the lead as the field headed for the Turn 1/2 chicane on the restart.

Da Costa was initially hesitant to break away, with Porsche also asking him to "just stay ahead" of Frijns "if necessary" in order to keep Wehrlein, who'd lost his wing by running clumsily into the back of Edoardo Mortara, in the fight at the front of the field.

But as energy saving gave way into a flat-out sprint to the finish, Porsche - which still harbours hopes of catching Jaguar in the teams' championship - allowed da Costa to break clear of Mitch Evans, telling da Costa: "We will not risk the race win. Stay in front."

Frijns got back ahead of Evans for second at the start of the penultimate lap and hunted da Costa down gamely but ran out of laps to pass the Porsche, instead having to settle for a second podium finish of the weekend, a repeat of the 1-2 in Saturday's first race.