Lewis Hamilton set a blistering pace in the only practice session ahead of qualifying for the Italian Grand Prix.
It is a weekend that again sees F1 trial the sprint that made its debut in Silverstone, leading to a significant change in the schedule.
Unsurprisingly, with only one hour of practice ahead of qualifying, all drivers wasted no time in taking to Monza's 'Temple of Speed' to gain as much running as possible.
And it was Hamilton who set the pace around the fastest track on the calendar with a lap of one minute 20.926secs, and that on the medium tyre as Mercedes remarkably opted not to use the softs at all throughout the session.
The seven-time champion, who heads into this weekend three points adrift of Max Verstappen in the drivers' standings, finished 0.452s clear of the Red Bull driver.
McLaren's Lando Norris had split the duo late on with a lap of 1:21.202s, only for it to be deleted for exceeding track limits at the final corner, as occurred for a number of drivers.
Hamilton set the early pace with a lap of 1:22.262s on the medium compound before Perez, with a relatively fresh power unit in his Red Bull after it was fitted ahead of the Dutch Grand Prix on Sunday, edged ahead by 0.135s after 20 minutes.
Ahead of the soft-tyre runs, McLaren's Daniel Ricciardo put in a surprising lap to take over at the top of the timesheet by 0.025s from Perez before Bottas put himself in the mix with a 1:21.451s, which was eventually good enough for third fastest.
On soft tyres, Verstappen then went quickest by 0.073s before Hamilton produced his sublime leading lap, albeit on the yellow-marked Pirelli mediums.
Behind the leading trio, with Mercedes fully expected to have the power edge at this track, Aston Martin's Lance Stroll was three-quarters of a second down, ahead of last year's race winner Pierre Gasly in his AlphaTauri.
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