Carlos Sainz claimed what could be his final victory as a Ferrari driver at the Mexico City Grand Prix last weekend. It was an accomplished drive from the Spaniard, who converted a sublime pole position. Sainz wanted to sign off with at least one more win before he left the team at the end of the season. He hasn’t stood on the top step since round three in Australia back in March. Charles Leclerc has won three times since then, twice in the four-race run between Italy and the United States. But this time it was the Spaniard who had the edge. Sainz lapped more than two-tenths faster than Max Ve…