Lewis Hamilton bested Mercedes teammate George Russell to top spot in a treacherously slippery but uninterrupted first practice session at the Las Vegas Grand Prix.

The Las Vegas Strip Circuit started in extremely low-grip condition. Large swaths of the track were coated in dust, particularly down the Strip, which had been open to public traffic only hours before the start of the session.

The dustiness was compounded by cool early evening conditions, with track and ambient temperatures hovering at around 60 degrees F when practice began and dropping gently through the hour.

The tricky conditions prompted many minor mistakes, particularly in the big braking zone into the final chicane at the south end of Las Vegas Boulevard, with several drivers locking up taking to the escape road.