San Marino GP
Nigel Mansell, Williams FW11B Honda, leads Alain Prost, McLaren MP4-3 TAG, Gerhard Berger, Ferrari F1-87, Teo Fabi, Benetton B187 Ford, Michele Alboreto, Ferrari F1-87, Stefan Johansson, McLaren MP4-3 TAG, Eddie Cheever, Arrows A10 Megatron, Riccardo Patrese, Brabham BT56 BMW, Ivan Capelli, March 871 Ford, and Thierry Boutsen, Benetton B187 Ford, at the start.