1991 Italian Grand Prix

It was a third 1–2 in a row for Brabham in the Friday morning pre-qualifying session, with Mark Blundell back on top of the time sheets, eight tenths of a second faster than Martin Brundle. Olivier Grouillard was again third fastest for Fondmetal, his fifth pre-qualifying success of the season. Michele Alboreto took the last pre-qualification position in the Footwork, 1.5 seconds off Blundell's pace.

In his best pre-qualifying performance in his four attempts so far, Fabrizio Barbazza just missed out in fifth place in the AGS, albeit 1.6 seconds slower than Alboreto. His team-mate Gabriele Tarquini debuted the new JH27 car, but its engine failed on the first lap. Tarquini reverted to the JH25B, but could only manage sixth fastest. Alex Caffi was a couple of tenths of a second further back in seventh in the other Footwork, while Pedro Chaves remained stuck in the pits after the worn engine in his Coloni refused to start.[2]

In qualifying, Ayrton Senna took pole again, with title rival Nigel Mansell second, the Englishman complaining of traffic on his final two hot laps. Gerhard Berger was third, followed by Riccardo Patrese, Alain Prost, Jean Alesi, Schumacher, Nelson Piquet, in his 200th Grand Prix, Moreno, and Pierluigi Martini, in the Ferrari powered Minardi.

At the start Senna got away well from Mansell, Berger, Patrese, and Alesi, with everyone making it through the Rettifilo double chicane. Moreno was an early casualty as he spun off on lap 2 with the Jordan's suspension breaking just before the spin also just behind the leaders.

Patrese at the front started to charge, first he disposed of Berger, and then Mansell. Martini had spun off in the Minardi by lap 8 at Roggia behind the leaders. On lap 26 he passed Senna at the Ascari chicane, but on the following lap a gearbox failure took him out. Senna now led from Mansell and Berger, with Mansell pressuring Senna for the lead, and on lap 34 he took it with a perfectly timed out-braking manoeuvre going into the Ascari chicane. Senna proceeded to pit for tyres and emerged down in fifth place, but in no mood to stay there. Senna proceeded to pass Schumacher going into Ascari, and then slipstreamed passed Berger into the first corner, and got back to second by passing arch-rival Prost going into the second chicane. Mansell meanwhile cruised to victory from Senna, Prost, Berger (despite pulling off just after the start/finish line with electrical problems), Schumacher, and Piquet, Alesi having retired with a blown engine. With four races to go Senna still led Mansell by 18 points, but this race confirmed that Mansell and Williams could beat Senna's McLaren in a straight fight.