How do you replace a seven-time world champion and the most successful driver in F1 history? That’s the unique dilemma Mercedes are facing right now. They have known since the winter that Lewis Hamilton was going to join Ferrari for 2025. Team principal Toto Wolff wasn’t surprised by the decision itself, merely by the timing. But his focus has now turned to finding a successor. According to Ted Kravitz, he may wait until August before he makes a final decision. That could be a risk in itself, because some of the best drivers on the market may sign elsewhere. With more than half the grid out of…