Carlos Sainz has confirmed that he’ll race for Williams next season, ending the long-running saga around his future. The future of Sainz has been one of the biggest stories in the F1 driver market since Ferrari signed Lewis Hamilton in February. The Spaniard would initially have hoped to join either Red Bull or Mercedes. But the world champions, who have just reaffirmed their faith in Sergio Perez, had little interest in reuniting Sainz with Max Verstappen after a tense rookie partnership at Toro Rosso in 2015. Mercedes, meanwhile, have always seemed to favour academy talent Kimi Antonelli. Fo…