What happened: Charles Leclerc led the opening practice session at the Mexico City Grand Prix, setting the fastest lap for Ferrari. Championship leader Kimi Antonelli finished second fastest, while Frederik Vesti rounded out the top three.

Why it matters: Antonelli holds a 123-point lead over George Russell with five rounds remaining and can secure the drivers' championship by finishing ninth or better on Sunday. Leclerc arrives in Mexico after finishing second in Austin, where Antonelli passed Leclerc to retake the lead at Circuit of the Americas.

What to watch: Second practice takes place later Friday at the Autódromo Hermanos Rodríguez, followed by qualifying on Saturday.