What happened: Williams announced the signing of Carlos Sainz from Ferrari on a multi-year contract starting 2025. Sainz will partner incumbent Alex Albon. The move comes after Williams' improved 2024 performance.

Why it matters: Sainz's experience from Ferrari and podium pedigree elevates Williams' midfield aspirations. It stabilizes their lineup amid driver market frenzy, potentially improving constructors' standings.

What to watch: Monitor final 2025 seats at Sauber and Haas; watch Williams upgrades in late 2024 races.