Nairo Quintana came second on the stage to take the red jersey, while Roglic withstood a barrage of attacks to take third on the day and second overall. López crashed late in the stage and drops to third on the GC.
After suffering through 2018 with illness, Stetina has spent the 2019 season mixing up WorldTour duties with gravel and mountain bike racing, and a strong performance on stage 8 of the Vuelta shows he's back to his best.
The Slovenian time-trial ace is better than his rivals in the race against the clock. The question is whether he can match them in the mountains.