Lewis Hamilton once again dominated practice in Las Vegas on Thursday night, in the same week he admitted considering ending his season early.
The Brit had a disastrous weekend in Brazil last time out, but has roared back into the fight with session-leading lap times in both FP1 and FP2, with his team-mate George Russell also putting in a strong showing.
Max Verstappen and Red Bull team-mate Sergio Perez failed to show any pace in the chilly evening, setting the 17th and 19th fastest times respectively in a weekend where the former could seal the drivers' title.
Vegas will also be crucial for the constructors' title, with Red Bull fighting to retain their crown against Ferrari and McLaren – both of whom had significantly stronger sessions.