San Marino GP: Ayrton Senna, McLaren MP4-5 Honda, leads Alain Prost, McLaren MP4-5 Honda, Riccardo Patrese, Williams FW12C Renault, Alessandro Nannini, Benetton B188 Ford, Nigel Mansell, Ferrari 640, Nelson Piquet, Lotus 101 Judd, Derek Warwick, Arrows A11 Ford, and Andrea de Cesaris, Dallara BMS-189 Ford, into Tosa on the opening lap.
Ayrton Senna, McLaren MP4-5 Honda, leads Alain Prost, McLaren MP4-5 Honda, Riccardo Patrese, Williams FW12C Renault, Alessandro Nannini, Benetton B188 Ford, Nigel Mansell, Ferrari 640, Nelson Piquet, Lotus 101 Judd, Derek Warwick, Arrows A11 Ford, and Andrea de Cesaris, Dallara BMS-189 Ford, into Tosa on the opening lap.