Second practice kicks off in just under 10 minutes' time now.
He goes nearly 0.4s ahead of Russell to top first practice.
Top 10: Hamilton, Russell, Norris, Leclerc, Verstappen, Sainz, Alonso, Piastri, Gasly and Perez.
Hamilton has just gone fastest in sector one though...
Russell is now P1 - 0.090s ahead of Hamilton.
A 1m35.487s puts him 0.132s ahead of teammate Russell.
He sets a 1m35.619s to go 0.3s ahead of Norris at the top of the timesheets.
We're into the final five minutes now.
Norris on top now with a 1m35.954s as Verstappen only goes sixth, 0.8s off his title rival.
A 1m36.430s now for Leclerc as he goes fastest - 0.497s ahead of Hamilton.
A five-place grid penalty for Bottas as he takes his fourth energy store of the year.
Hamilton, Leclerc, Russell, Magnussen, Norris, Gasly, Sainz, Ocon and Perez is the top 10.
Leclerc goes second on the softs in the Ferrari, 0.085s behind Hamilton's medium time from earlier.
Magnussen goes fourth, also on the softer rubber.
A strong lap from the Alpine to go fourth behind the two Mercedes drivers and Leclerc.
Hamilton, Russell, Leclerc, Perez, Norris, Sainz, Piastri, Magnussen, Ocon and Verstappen.
Hamilton and Russell improve to make it a Mercedes 1-2. Hamilton 0.7s ahead of Russell.
A 1m38.155s for the seven-time world champion as he goes 1.3s ahead of Verstappen.
Everyone out there on the mediums - except Red Bull - which have opted for the softs with both cars.
Russell takes to the top of the order now with a 1m39.595s as Leclerc and Norris slot in behind.
Hamilton leads from Verstappen, Leclerc, Russell, Magnussen, Norris, Alonso, Sainz, Hulkenberg and Perez.
A 1m41.900s for the Ferrari driver which puts him 0.6s clear of Russell.
Verstappen lowers the benchmark considerably to a 1m44.239s. He's already running on the softs. Expect the times to tumble as drivers get used to the track and the circuit grips up.
Magnussen sets a 1m47.656s in the Haas which puts him 1.1s ahead of Perez in the Red Bull. Norris slots into third, 2.5s down on the Dane.
Lawson reports over team radio: "It feels like I'm driving in the wet, honestly."
The first practice session of the weekend is now underway in Las Vegas under the lights.
It's worth noting due to the timings in Las Vegas, practice is taking place on Thursday - not Friday like usual.