It was a familiar sight at the top of the timesheets for Formula 1's for practice session of 2017, with the Silver Arrows first and second.
Mercedes' Lewis Hamilton led the field with a 1'24.220 on ultra-soft tyres which was five-and-a-half seconds quicker than in the same session last year.
The Brit left team mate Valtteri Bottas at a reasonable distance, 0.583s behind, with Red Bull Racing pair Daniel Ricciardo and Max Verstappen following at respectively 0.666s and 1.026s although the Milton Keynes cars were shod on the super-soft rubber.
Ferrari appeared to leave its pre-season momentum in the garage, with Kimi Raikkonen setting his best time on the super-soft compound but 1.152s off Mercedes' pace reference and leading team mate Sebastian Vettel by a tenth of a second. Like Red Bull, Ferrari also stayed off Pirelli's ultra-soft tyre.
The German concluded FP1 earlier than scheduled, heading back to the Scuderia's garage ten minutes before the end of the session with a suspected MGU-K problem on his SF70H.
Williams' Lance Stroll was the first man out on the track, topping the timesheets on his first flying lap on a Grand prix weekend. The Canadian acquitted himself well, and avoided blotting his copy book with a fastest lap that put him 13th overall.
Renault's Jonathan Palmer was a victim early on of a seal fault issue while McLaren's Stoffel Vandooren struggled behind the wheel of a recalcitrant McLaren, the pair closing out the timesheets respectively 4.365 and 4.475 off the leader's pace.
GALLERY: F1 drivers' wives and girlfriends
Keep up to date with all the F1 news via Facebook and Twitter
Helmut Marko believes that Red Bull and Max Verstappen are unlikely to challenge for victory…
Automotive giant General Motors is reportedly back in the game as a potential entrant in…
The opening day of running at the Las Vegas GP was a smooth but chilly…
Williams is continuing to fight uphill battles this weekend in Las Vegas as a knock-on…
It was a solid start to the Las Vegas weekend for Ferrari with Carlos Sainz…
Lando Norris didn’t hold back in his assessment of McLaren’s performance on the opening day…