Sebastian Vettel showed some impressive pace in FP2 at Monza, up his rivals on the hard and the medium tyres.
The afternoon's session ahead of Sunday's Italian Grand Prix got off to a frantic start as the drivers were quickly down to business.
With the track temperature a toasty 42'C, the Lotus drivers and the McLaren duo set the early pace before Sebastian Vettel came storming through with a 1:25.038.
The reigning World Champion was soon under attack from his team-mate Mark Webber, who missed the very start of the 90-minute session as his Red Bull mechanics replaced his KERS battery.
On track, the Aussie showed good pace and slotted into second place, 0.215s down his team-mate while Fernando Alonso was third and Lewis Hamilton fourth.
Swapping to the softer option tyres, the mediums, 30 minutes in, Vettel extended his advantage with a 1:24.721.
Webber swapped soon after and retained his second place but was now 0.623s off his team-mate's pace while Nico Rosberg climbed to third. The Mercedes, however, was almost a full second down on Vettel's best.
One by one the drivers swapped over with Hamilton the next to take third before he was dropped by Alonso. The Lotus drivers got involved in the battle with Kimi Raikkonen taking third ahed of Romain Grosjean. They were both 0.663s off the pace.
The final 30 minutes saw the drivers saw the drivers swap to long distance heavy fueled runs on worn tyres as they conducted race simulations. As such the times did not change and Vettel finished P1.
It must be noted that the Red Bull racer showed solid pace on his long runs as his pace improved by a second over the course of 12 laps to get into the 1:28s. By contrast Paul di Resta was in the 1:29s and Nico Hulkenberg that 1:30s. Alonso on the mediums was in the 1:29s.
1 Sebastian Vettel Red Bull 1:24.453 39 laps
2 Mark Webber Red Bull 1:25.076 +0.623 39 laps
3 Kimi Raikkonen Lotus 1:25.116 +0.663 36 laps
4 Romain Grosjean Lotus 1:25.116 +0.663 40 laps
5 Fernando Alonso Ferrari 1:25.330 +0.877 38 laps
6 Lewis Hamilton Mercedes 1:25.340 +0.887 39 laps
7 Nico Rosberg Mercedes 1:25.367 +0.914 42 laps
8 Felipe Massa Ferrari 1:25.519 +1.066 29 laps
9 Jenson Button McLaren 1:25.532 +1.079 42 laps
10 Sergio Perez McLaren 1:25.627 +1.174 39 laps
11 Paul di Resta Force India 1:25.830 +1.377 40 laps
12 Esteban Gutierrez Sauber 1:25.888 +1.435 40 laps
13 Adrian Sutil Force India 1:26.028 +1.575 37 laps
14 Pastor Maldonado Williams 1:26.138 +1.685 36 laps
15 Jean-Eric Vergne Toro Rosso 1:26.224 +1.771 32 laps
16 Nico Hulkenberg Sauber 1:26.385 +1.932 43 laps
17 Daniel Ricciardo Toro Rosso 1:26.599 +2.146 39 laps
18 Valtteri Bottas Williams 1:27.198 +2.745 44 laps
19 Max Chilton Marussia 1:27.548 +3.095 30 laps
20 Charles Pic Caterham 1:27.696 +3.243 37 laps
21 Giedo van der Garde Caterham 1:27.771 +3.318 38 laps
22 Jules Bianchi Marussia 1:28.057 +3.604 32 laps