Isaac headed to Western Australia for Round 3 of the 2026 Radical Cup Australia championship, held at the Perth Super440 at Wanneroo Raceway from July 31st to August 2nd.

It ended up being one of Isaac's strongest weekends of the year. A disqualification in Race 1 left him starting Race 2 from the back of the grid, but he charged through the field to pass 16 cars and finish second, setting the fastest lap of the race along the way.

After friday, he finished with three podium finishes from three races, with two more podium finishes on Sunday, a third and another second.