Charles Leclerc topped the timesheets in first practice at the Italian Grand Prix, marking a perfect start to Ferrari's weekend on home soil.
The Monégasque crossed the line setting a time of 1:26.153, with his teammate Lewis Hamilton just under two-tenths behind.
Mercedes' George Russell finished in third, while Racing Bulls' Liam Lawson was fourth.
Title leader Kimi Antonelli was 0.636 seconds off the pace in fifth.
Antonelli, 20, will start his home race from the back of the pack as he serves a grid penalty for taking on a new engine.
Lando Norris arrives at Monza as a driver in form following consecutive victories in Hungary and the Netherlands to raise hopes of defending his world title crown.
The Englishman, 83 points behind Antonelli, finished sixth, 0.711 seconds off the leading pace.
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Four-time world champion Max Verstappen was among a number of drivers stood down for the first session as the teams rotated their line-ups to fulfil their rookie obligations.
Estonian driver Paul Aron finished as the leading youngster in 10th for Alpine. Verstappen's replacement Ayumu Iwasa ended up 17th of the 22 drivers.
Lawson is replacing Isack Hadjar for a second race in a row as he continues to recover from a wrist injury.
The FIA announced on Thursday that the Italian Grand Prix has been declared a heat hazard as the European heatwave continues.
Second practice will take place at 3 p.m. BST on Friday.
PA contributed to this report.
