Charles Leclerc led Alex Albon's Williams in a mixed-up start to Formula 1's Las Vegas Grand Prix weekend in Thursday afternoon's opening practice session.
A slightly adjusted timetable for 2025 meant the new sight of F1 cars on the Vegas track at dusk initially rather than in full darkness, but with cold track temperatures and plenty of dust on the circuit meaning times well off the pace at first.
Ferrari, Williams and Red Bull generally looked the most comfortable cars in what may not turn out to be an especially representative session.
Although Max Verstappen was quickest on the medium tyre runs and quickly went fastest on soft tyres too, Leclerc's repeated improvements cemented his and Ferrari's place on top by the end.
And Verstappen was pushed down to third behind both Albon and the other Red Bull of Yuki Tsunoda - a driver who really, really needs an impressive weekend.
Carlos Sainz backed Albon up by making it two Williams in the top five.
The McLarens had a relatively messy session, both Lando Norris and Oscar Piastri making a few minor errors and ending up either side of Isack Hadjar's Racing Bulls in sixth and eighth.
Last year's Vegas dominator Mercedes was ninth and 10th with George Russell and Kimi Antonelli.
FP1 times
1 Charles Leclerc (Ferrari) 1m34.802s
2 Alex Albon (Williams) +0.166s
3 Yuki Tsunoda (Red Bull) +0.269s
4 Max Verstappen (Red Bull) +0.307s
5 Carlos Sainz (Williams) +0.377s
6 Lando Norris (McLaren) +0.456s
7 Isack Hadjar (Racing Bulls) +0.497s
8 Oscar Piastri (McLaren) +0.648s
9 George Russell (Mercedes) +0.732s
10 Kimi Antonelli (Mercedes) +0.736s
11 Lewis Hamilton (Ferrari) +0.759s
12 Pierre Gasly (Alpine) +0.787s
13 Liam Lawson (Racing Bulls) +0.907s
14 Fernando Alonso (Aston Martin) +0.944s
15 Lance Stroll (Aston Martin) +1.092s
16 Ollie Bearman (Haas) +1.188s
17 Esteban Ocon (Haas) +1.321s
18 Nico Hulkenberg (Sauber) +1.368s
19 Gabriel Bortoleto (Sauber) +1.596s
20 Franco Colapinto (Alpine) +1.956s
