Ferrari driver Charles Leclerc led the way following an eventful first practice session for the Italian Grand Prix.
The opening running at a rain-hit Monza was suspended twice after Kimi Raikkonen and Sergio Perez both crashed out.
On a drying track, Leclerc, who registered his maiden grand prix victory in Belgium last weekend, put his Ferrari at the top of the order.
Leclerc finished ahead of the McLaren duo of Carlos Sainz and Lando Norris, with championship leader Lewis Hamilton fourth.
The first action of the weekend started on a wet track and Raikkonen became the first high-profile victim of the tricky conditions.
Raikkonen lost control of his Alfa Romeo at the final corner, heading backwards into the barrier.
The veteran Finn walked away from the incident, but sustained damage to his car. The red flags were issued as Raikkonen's car was removed from the gravel.
Toro Rosso's Daniil Kvyat was the first to take advantage of the easier conditions, as the Russian went fastest before he was bumped off the top by Sainz and then by Leclerc.
Leclerc would finish 0.306 seconds ahead of Sainz with Norris half-a-second back in third.
Hamilton, who holds a 65-point championship lead heading into the final round of the European campaign, spent the final minutes following Sebastian Vettel, before clocking the fourth quickest time.
Red Bull driver Alex Albon was fifth ahead of Kvyat. The Russian was followed by Max Verstappen and Vettel.
