Spanish GP
Ayrton Senna, Lotus 99T Honda, leads Alain Prost, McLaren MP4-3 TAG, Nelson Piquet, Williams FW11B Honda, Michele Alboreto, Ferrari F1-87, Gerhard Berger, Ferrari F1-87, Eddie Cheever, Arrows A10 Megatron, and Thierry Boutsen, Benetton B187 Ford.