Some rare Thursday night action in Formula 1 saw the sport return to the Las Vegas strip for the start of a glitzy grand prix weekend.
The cold and dusty conditions meant that a number of drivers took trips off track as they got used to the challenging conditions, but they did all avoid damaging their cars.
Lewis Hamilton and George Russell dominated the timing sheets after a set of brilliant laps late in the session, with the seven-time world champion leading his team-mate by nearly four tenths of a second and almost a full second ahead of anyone not driving a Mercedes – including Max Verstappen, down in fifth behind title rival Lando Norris.
Norris was the third fastest car on the track, followed by Charles Leclerc, as Ferrari and McLaren continue to duke it out with Red Bull for the constructors' title.
Yes, FP2 is due to take place later on Thursday, with the championship protagonists getting their cars tuned into the track. The session is due to start at 10pm PT.