What happened: Lewis Hamilton pulled his Ferrari to a halt during the second practice session at the Mexico City Grand Prix, bringing out a Virtual Safety Car. Ferrari instructed Hamilton over team radio to stop the car on track with 32 minutes remaining in FP2.

Why it matters: The lost running curtails crucial race-simulation data for Lewis Hamilton at the high-altitude Autodromo Hermanos Rodriguez. Any mechanical issue also risks power unit penalties if components require replacement ahead of Sunday.

What to watch: Ferrari will inspect the car ahead of Saturday's final practice session and qualifying in Mexico City.