After holding off early pressure from Nissan's Norman Nato and Jaguar's Sam Bird, the Andretti Autosport driver cruised to a lights-to-flag win after leading every lap of the 24-lap race.
Cassidy drove with accuracy, starting tenth on the grid and finishing first overall after 32 laps of racing in a field of twenty-two vehicles. The New Zealander Cassidy took the lead many times throughout the Portland E-Prix race.