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In contrast to Cassidy's point-less outing in Portland, Porsche's Pascal Wehrlein scooped an additional 13 points in the US, making him equal to Jaguar's Mitch Evans with 155 points and, critically, just 12 points off standings leader Cassidy.
"We reduced the gap, and we made everything very open for London," said Wehrlein, speaking after the final round in Portland. "We're in the fight for all the championships. That was the big goal of the weekend and we achieved it."
But it wasn't all plain sailing for the Porsche driver. After securing just one point in Round 13, Wehrlein suffered another blow early in Round 14 in Portland, losing his front wing when the pack concertinaed.
"I definitely thought it was game over. It was quite similar to what happened already to many drivers this year. It was just a concertina effect and I hit the car in front. Luckily, with another contact, it removed the front wing," he explained after the race.
Lucky for Wehrlein, the Porsche driver escaped relatively unscathed, managing to recover the race and finish fourth overall, scooping 12 points in the process. With a single point earned the day before, Wehrlein had successfully closed the gap to just 12 points between him and Cassidy by the end of Portland.
"I'm very happy to have finished the race. I think today we saw a lot of front wing damage and a lot of people having to stop to change it, so we'll definitely take those points.
Down to the wire for Wehrlein in London
After the drama in Portland opened up the Drivers', Teams' and Manufacturers' championships with just two rounds to go, it all boils down to the double-header, season finale in London on July 20 and 21. With all three contenders vying for their first Drivers' title, Werhlein will need to put in a faultless performance in the UK capital to be in with a chance of sealing it.
"There's definitely a lot of stuff to be checked and analysed, because the whole weekend I wasn't happy with the balance of my car," said Wehrlein. "We need to fix that for London and come in prepared."