Ferrari's Charles Leclerc goes fastest in Friday practice at the Mexico City Grand Prix.
Charles Leclerc was fastest in both practice sessions on Friday
Mercedes driver Kimi Antonelli, who is poised to clinch his first world title on Sunday, was fourth fastest behind team-mate George Russell.
Only a victory by Russell or Ferrari's Lewis Hamilton can theoretically stop Antonelli becoming champion on Sunday. Even then, Antonelli only needs ninth place if Russell wins and 10th if Hamilton does.
Leclerc, who topped both sessions on Friday, was 0.103 seconds quicker than Norris, with Russell just 0.003secs further adrift.
Antonelli was 0.217secs off the pace, and ahead of the Red Bulls of Max Verstappen and Isack Hadjar.
Leclerc's team-mate Lewis Hamilton was 11th overall after stopping on track with a technical problem before completing his qualifying simulation runs on the soft tyre.
Source: BBC Sport