After confirming Nico Hulkenberg as one of their drivers, Audi are now trying to recruit Carlos Sainz as his teammate. But it’s proving to be a challenge. Sainz, a three-time Grand Prix winner, is perhaps the best free agent on the market right now. The paddock have known he would be available since the winter when Ferrari confirmed the 2025 arrival of Lewis Hamilton. Given his credentials, he would very much be a statement signing for the German manufacturer ahead of their 2026 entry. But you can also understand why Sainz might be hesitant. He’d effectively be writing off next season given th…