1988-89 McLaren-Honda
Prost supported Ron Dennis's decision to hire Ayrton Senna from Lotus to partner him, despite knowing that the Brazilian's speed, and wanted to be challenged by the best. The team comfortably won the constructor's but the drivers were feuding every race. For 1988, only the best 11 results counted toward the championship.
Prost scored 105 points during the year, but only 87 points were counted towards the championship. Senna scored 94 points, with 90 points counted toward the championship as he won 8 races to Prost's 7.
While Prost scored more points during the season, Senna won the first of his 3 world drivers' titles. 1989 saw Prost win his third title, but the intra-team dynamics reached toxic levels and he decided to move away and join Ferrari for 1990.
Prost won just 4 races as against Senna's 6 but his consistency in bagging points, with 11 podiums clinched him the title in controversial and acrimonious circumstances in Suzuka, Japan.