Mercedes headed into the Hungarian Grand Prix weekend as the favourite, logically so because the W10 typically excels on the slower corners that predominate at the twisty Hungaroring, despite the fact that Ferrari and Red Bull have become increasingly strong of late.
But Friday's rain-affected practice sessions have thrown an additional curveball into the mix.
The major upgrade Mercedes introduced at Hockenheim last weekend, featuring new front- and rear-wing endplates, and a number of tweaks to the complex bargeboard/turning vane assembly, has broadly worked as hoped. But Mercedes has understandably yet to master the car in its adjusted trim. So, a compromised run through Friday practice won't have helped.