The 1991 Monaco Grand Prix was a Formula One race held at Monaco on May 12, 1991.

Report

Ayrton Senna shocked no-one by taking pole position, but second place was a surprise with Stefano Modena taking full advantage of the superior Pirelli qualifying tyres to be second followed by Patrese, Piquet, a disappointing Mansell, Berger, Prost, Moreno, Alesi, and de Cesaris. Alex Caffi had a huge accident in practice and would not participate in the race. Elsewhere Martin Brundle was disqualified for missing a weight check. At the start Senna got away well followed by Modena, Patrese, Mansell, and Prost. In the usual first corner mayhem Berger ran into the back of Piquet, dropping the Austrian to the back of the pack and breaking Piquet's suspension, Berger would later crash out. Senna quickly built up a huge lead over Modena and Patrese, and both the chasers were eliminated on lap 42 when Modena's engine blew in the tunnel spreading oil on the track which caused Patrese to crash. Senna now had a huge lead over Prost and Mansell, but the Englishman was in no mood to stay third and passed Prost with a daring move going into the chicane. Prost would later pit to repair a loose wheel and problems with the stop dropped him down to fifth. Senna duly won his fourth Monaco Grand Prix in five years by 18 seconds over Mansell, who drove a brilliant race, Alesi, Moreno, Prost, and Emanuelle Pirro in the Dallara. The second place finish was Nigel Mansell's first points of the season and the gearbox issues that had troubled the start of his season did not re-appear.

Classification

Pos	No	Driver	Constructor	Laps	Time/Retired	Grid	Points
1	1	Ayrton Senna	McLaren-Honda	78	1:53:02.334	1	10
2	5	Nigel Mansell	Williams-Renault	78	+ 18.348	5	6
3	28	Jean Alesi	Ferrari	78	+ 47.455	9	4
4	19	Roberto Moreno	Benetton-Ford	77	+ 1 Lap	8	3
5	27	Alain Prost	Ferrari	77	+ 1 Lap	7	2
6	21	Emanuele Pirro	Dallara-Judd	77	+ 1 Lap	12	1
7	25	Thierry Boutsen	Ligier-Lamborghini	76	+ 2 laps	16
8	32	Bertrand Gachot	Jordan-Ford	76	+ 2 laps	23
9	29	Éric Bernard	Lola-Ford	76	+ 2 laps	13
10	26	Érik Comas	Ligier-Lamborghini	76	+2 laps	26
11	22	Jyrki Järvilehto	Dallara-Judd	75	+ 3 Laps	21
12	23	Pierluigi Martini	Minardi-Ferrari	72	+ 6 laps	14
Ret	11	Mika Häkkinen	Lotus-Judd	64	Oil leak	25
Ret	24	Gianni Morbidelli	Minardi-Ferrari	49	Gearbox	17
Ret	15	Maurício Gugelmin	Leyton House-Ilmor	43	Throttle	15
Ret	4	Stefano Modena	Tyrrell-Honda	42	Engine	2
Ret	6	Riccardo Patrese	Williams-Renault	42	Spun Off	3
Ret	8	Mark Blundell	Brabham-Yamaha	41	Spun off	19
Ret	9	Michele Alboreto	Footwork-Porsche	39	Engine	22
Ret	3	Satoru Nakajima	Tyrrell-Honda	35	Spun off	11
Ret	30	Aguri Suzuki	Lola-Ford	24	Engine	20
Ret	33	Andrea de Cesaris	Jordan-Ford	21	Throttle	10
Ret	16	Ivan Capelli	Leyton House-Ilmor	12	Brakes	18
Ret	17	Gabriele Tarquini	AGS-Ford	9	Gearbox	24
Ret	2	Gerhard Berger	McLaren-Honda	9	Spun Off	6
Ret	20	Nelson Piquet	Benetton-Ford	0	Suspension	4
DNQ	12	Julian Bailey	Lotus-Judd
DNQ	18	Fabrizio Barbazza	AGS-Ford
DNQ	10	Alex Caffi	Footwork-Porsche
DNQ	7	Martin Brundle	Brabham-Yamaha
DNPQ	34	Nicola Larini	Lambo-Lamborghini
DNPQ	35	Eric van de Poele	Lambo-Lamborghini
DNPQ	31	Pedro Chaves	Coloni-Ford
DNPQ	14	Olivier Grouillard	Fondmetal-Ford

Notes

• Pole position: Ayrton Senna - 1:20.344
• Fastest lap: Alain Prost - 1:24.368 on lap 77
• Last race: Julian Bailey
• Gerhard Berger made an error at the first corner at the start and he demoted to 26th.
• Mansell's first points of the season (2nd position)
• Martin Brundle DSQ for not weighing in by FIA Stewards
• Alex Caffi had a huge shunt by the swimming pool section of the circuit in the Footwork-Porsche
• Stefano Modena in the Tyrrell Honda V10 put in a stunning qualifying lap to join the front row of the grid with Senna in his V12 powered Honda Marlboro McLaren
• In the opening stages of the race, a marshal picking up some debris from an earlier incident at Ste Devote was almost clipped by Ayrton Senna
• Ayrton Senna's 4th victory out of 4 races in the 1991 season

References

• Unless otherwise indicated, all race results are taken from