The 2025 Formula 1 grid is exactly 80 percent complete. Red Bull, RB and Sauber still have four seats to fill between them. Max Verstappen will stay with the reigning world champions, but Sergio Perez remains vulnerable despite signing a new contract in the summer. The uncertainty around the Mexican means RB can’t confirm either of their drivers. Yuki Tsunoda and Liam Lawson are both in contention to replace Perez and will battle it out in the remaining six races. Should either of them succeed, F2 title contender Isack Hadjar could get a chance at the junior team. Meanwhile, Sauber announced t…