Audi now faces one clear hurdle in its efforts to convince Ferrari exile Carlos Sainz to reject a move to Williams in favour of joining Sauber for the 2025 Formula 1 season. Sainz remains one of the biggest names on the market after Ferrari signed Lewis Hamilton to join them next year. The Mercedes driver will swap Brackley for Maranello with a multi-year contract to join Charles Leclerc in red. Sainz was already set to be out of contract after 2024. But while Ferrari confirmed Sainz’s departure in February, his options to find a front-running drive are diminishing. Mercedes are the only top-t…