Schubert Motorsport locked out the front row in qualifying, with Rast securing a record-breaking 26th pole position ahead of reigning champion van der Linde.
Rast led away at the start and resisted a challenge from van der Linde into turn three, while Manthey Porsche driver Thomas Preining moved up to third and Jack Aitken slipped back four places to seventh in his Emil Frey Ferrari.
Preining’s chief rival Bortolotti ran ninth, but then slowed with a right-rear puncture before the opening lap was completed and headed for the pitlane.
Rast edged clear of van der Linde in the race’s opening third to lead by two seconds. The gap was pegged back to 1.5s during a light rain shower, which was not heavy enough to necessitate a switch to wet-weather tyres.
Preining was the first of the front three to make his mandatory pitstop with 25 minutes of the race remaining, with van der Linde and Rast making their stops over the next two laps.
Rast emerged still in front, and he controlled proceedings until the chequered flag for his first win of 2023 by 1.2s from van der Linde.
Preining came home a further 3.5s second behind in third, while Bortolotti trailed home in 22nd. The result leaves Preining 10 points clear of Bortolotti heading into next month’s deciding round at Hockenheim.
Source: Autosport