Red Bull's Max Verstappen completed a clean sweep of practice to set himself up as favourite for pole position at the season-opening Bahrain Formula One Grand Prix on Saturday.
"To be seven-10ths up on Lewis... I'm really looking forward to see if he can carry that on to qualifying," said 2009 champion Jenson Button, now a pundit for Sky Sports.
"Mercedes will be quicker in qualifying, when the conditions will be cooler, but Max is on it every time."
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Valtteri Bottas was fourth in the other Mercedes, and Verstappen's new team mate Sergio Perez was fifth but 1.331 slower than the Dutchman.
Ferrari's new signing Carlos Sainz was sixth on the timesheets and collected a cheeky wave from former McLaren team mate Lando Norris as the Briton went past.
Alfa Romeo's Kimi Raikkonen was seventh-fastest and Alpine's Esteban Ocon a promising eighth.
Two times world champion Fernando Alonso, returning after two years out, was 15th for Alpine.
Four times world champion Sebastian Vettel was 14th after exclaiming that "something from the front left corner came off and hit me in the face" and returning to the pits.
German rookie Mick Schumacher, son of Ferrari great and seven times champion Michael, was again quicker than his Haas team mate Nikita Mazepin.

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