Why was the Sepang practice day a disappointment for Williams?

Williams faced a challenging practice day at Sepang as they assessed their upgrade package from the Azerbaijan Grand Prix. Both Alex Albon and Carlos Sainz reported difficulties with the car's high-speed performance, with Albon finishing 17th in the first session and last in the second, while Sainz improved but remained in the lower midfield. Albon expressed concerns about rear stability, while Sainz noted that high-speed corners were contributing to tyre degradation.

The team’s Chief Engineer, Paul Williams, acknowledged that Sepang presented a tougher test for their upgrades compared to Baku, highlighting the need to gather data on the car's limitations. With high tyre degradation expected due to the rough track surface and high temperatures, managing tyre performance will be crucial for the race. The team is focused on isolating the car's weaknesses to inform future developments.