Championship leader Oscar Piastri took his second win of the season after converting pole position in the Monza feature race, while Dan Ticktum and Carlin provided a late-race threat with a fortuitous tyre gamble.
Piastri got away well from pole to hold the lead into Turn 1, but had to watch his main championship rival Guanyu Zhou assume second place by passing Jehan Daruvala off the line. Daruvala struggled for traction at the start and lost another place to Liam Lawson, while Felipe Drugovich pressured him for fourth throughout the opening lap.
The race was neutralised soon after when Guilherme Samaia spun out of the race at the second Lesmo and brought out the safety car. On the restart on lap 5 Piastri managed to break the tow on the rundown to Rettifilo to see off Zhou, while Zhou then came under attack from a rapid Lawson and lost second place into the Roggia chicane.
Piastri, Lawson and Zhou spent the opening laps more or less matching each other’s pace, with the gap between the three of them never more than 1.5 seconds. On lap 5 Piastri set the fastest lap but wasn’t able to definitively break clear of DRS range from Lawson.
On lap 8 Juri Vips, who was running seventh between Theo Pourchaire and Ticktum, slowed suddenly with a mechanical failure in the middle of the Roggia chicane. That caught out Ticktum who made contact with the rear of the Hitech, although he escaped with no significant damage to his own car.
The safety car was brought out again while Vips’ car was cleared away, and the leaders took that opportunity to make their mandatory pit stop from softs to mediums. But Piastri, Lawson and Zhou were followed into the pits by everyone apart from Ticktum, Marino Sato, Christian Lundgaard, Marcus Armstrong and Alessio Deledda, who had started the race on mediums instead.
Sato then dropped out of the race with a mechanical problem of his own, which meant that Piastri rejoined the race in fifth place behind Deledda. Lawson lost out in the pitlane scramble and not only came out behind Zhou but also Daruvala.
At the restart on lap 11 Piastri immediately set about clearing Deledda to get back towards the front. Meanwhile Daruvala found a new turn of pace on his medium tyres and began battling with Zhou for net second.
Daruvala got ahead of Zhou at the Roggia chicane but completed the move off track and was ordered to give the place back. He did so on the main straight, but used the momentum to immediately repass Zhou into Rettifilo. But as they came to Roggia again, Zhou went around the outside and reclaimed the position from the Carlin.
By lap 13 Piastri, Zhou and Daruvala had got past Deledda and set about clearing Armstrong as well. Deledda fell back to ninth by the end of the lap, then at the start of lap 14 he made contact with Enzo Fittipaldi at Rettifilo. That allowed Fittipaldi and Robert Shwartzman through, but Drugovich lost out avoiding the HWA and dropped to P12.
Drugovich then dropped out of the midfield battle altogether thanks to a miscommunication with his team. He’d asked his engineer on the radio to check if his front wing was damaged in the incident, but his engineer thought he was reporting wing damage and called him in to pit for repairs — when Drugovich left the pits after the confusion he was in P18 and last.
At the front of the field, Piastri passed fellow Alpine junior Lundgaard for second place on lap 15 and only had Ticktum 1.5 seconds up the road. From the pace of Lundgaard, Armstrong and Deledda it was clear that the worn mediums had run their course, but Carlin kept Ticktum out in front to gamble on another safety car in the final phase of the race.
Piastri kept closing in, bringing the gap to half a second by lap 18. But Ticktum’s gamble paid off a few laps later when Lawson stopped on the main straight after his fire extinguisher went off and the safety car was deployed. Ticktum immediately pitted for softs and rejoined the race in P12, while Piastri led from Zhou, Pourchaire, Daruvala and Shwartzman.
The race restarted on lap 25, with six laps to go. While Piastri locked up heading to Rettifilo and had to get on the defensive to keep Zhou behind, Ticktum immediately began clearing the cars ahead with his fresh soft tyres. The Carlin driver had a hairy moment at Roggia when he was tapped off the road by Ralph Boschung and narrowly avoided collecting Roy Nissany, but he regrouped to hold seventh place by the end of the lap.
Over the next few laps Ticktum continued to improve with uncontested moves on Nissany, Shwartzman and Daruvala, then on the penultimate lap he passed Pourchaire into Rettifilo for third place. With half a second between him and Zhou and only another eight tenths to Piastri up the road, it seemed inevitable that Ticktum and Piastri would be fighting for the lead on the final tour.
But shortly after Ticktum got past Pourchaire, Bent Viscaal and David Beckmann came together at Rettifilo further down the pack and brought out yet another safety car. With just under two laps left to run, the race was completed under the safety car and Ticktum was forced to settle for third place behind winner Piastri and Zhou in second.
Pourchaire finished fourth ahead of Daruvala and Shwartzman. Richard Verschoor took seventh place from Lirim Zendelli, who made a two-stop strategy work to give MP Motorsport a double points finish, and Nissany and Armstrong rounded out the final points positions for DAMS.
With Piastri and Zhou finishing first and second, they remain in the same positions in the championship standings with 15 points separating them. Shwartzman remains third, albeit 21 points behind Zhou and 36 adrift of the lead.
Formula 2 returns on 25–26 September at the Sochi Autodrom in support of the Formula 1 Russian Grand Prix.