Lando Norris edged the new Formula 1 world champion Kimi Antonelli to top the first practice session at the Brazilian Grand Prix, as Colton Herta completed his F1 superlicence mission.
Norris set the pace with a 1m11.717s, lapping just 0.082s quicker than Antonelli.
McLaren is the only team that has brought upgrades to Brazil with a new front and rear wing, modified floor furniture and a beam wing.
Max Verstappen (Red Bull), who complained of "unacceptable downshifts", and Lewis Hamilton (Ferrari) made it four different teams in the top four, all within just over three tenths of a second.
George Russell was fifth fastest ahead of Isack Hadjar's Red Bull.
Gabriele Mini was the fastest of the six FP1-only rookies in seventh place for Alpine in his second successive FP1 outing, 0.852s off the pace and just under a tenth ahead of regular driver Franco Colapinto, who was ninth.
On home soil, Gabriel Bortoleto's Audi was eighth between the two Alpine drivers while Liam Lawson rounded out the top 10 for Racing Bulls.
McLaren's reserve driver Leonardo Fornaroli was 11th ahead of Haas's Ollie Bearman and Aston Martin's Fernando Alonso.
Rafael Camara finished his first FP1 session in 18th place, eight and a half tenths behind Bearman, as he builds up slowly to his unexpected grand prix debut this weekend - replacing Esteban Ocon.
Herta picked up the final point he needs to qualify for his F1 superlicence, as he surpassed the 100 kilometres of running required to earn the 40th and final point, when combined with his four other qualifying FP1 runs and his IndyCar results.
Cadillac thought it was mission accomplished in Mexico until it emerged that its FIA-verified calculations included an error on IndyCar's website. That meant Herta needed another FP1 outing in Brazil to finally get him over the line, removing a key obstacle to him replacing Valtteri Bottas in 2027, should the team decide to do so.
Bottas was 15th, and nine tenths quicker than Herta in FP1.
Freddie Slater's second FP1 outing ended up being even shorter than his first, as he'd completed just seven laps before his Audi ground to a halt, bringing out an early red flag.
It means Slater has been able to complete just 21 laps between his back-to-back first F1 practice outings in Mexico and Brazil.
Ferrari's Dino Beganovic also had a disrupted FP1 session as he lost a lot of time to his team needing to change his floor mid-session. He ended up with just 11 laps, having been told to abort his soft tyre lap for a car problem.
