the Constructors Championship with a then-record 199 points, 134 in front of second-placed Ferrari while Senna won his first World Championship by three points from Prost (Senna won 8 races to Prost's 7). Dennis had to manage the tension between his drivers. On the second lap of the Portuguese Grand Prix, Senna almost forced Prost into the pit wall at high speed as the Frenchman passed him and took control of the race, Prost going on to win while Senna could only finish sixth. The two had words about the incident after the race. By mid- it was becoming impossible to pacify the two warring drivers. Following a fall out in the aftermath of a broken promise between them at San Marino where Prost and Senna agreed before the race that whoever got to the first corner in front would not be challenged into that turn. After the restart following Gerhard Berger's crash, Senna outbraked Prost going into the Tosa turn and broke the agreement, something which angered Prost. Senna later denied making the agreement but Prost was backed up by Marlboro's John Hogan who had been with the drivers when the agreement was made. The result was that the two barely talked for the rest of the season. Prost angered Dennis when not only did he announce that he would be joining Ferrari for , thus ending a highly successful six-year stint with McLaren, but also with his public comments about the team and Honda allegedly favoring Senna at the Italian Grand Prix. Dennis then showed his anger in public after Prost, who won the race following an engine failure for Senna, dropped his winners trophy from the podium to the Tifosi showing how unhappy he was despite the win. Dennis flung the Constructors winners trophy at Prost's feet and walked off the podium. The "cold war" between the drivers came to a head at the Japanese Grand Prix when, at Honda's home track, Prost and Senna had their infamous collision while fighting for the lead late in the race which took Prost out and led to Senna's disqualification and gave Prost his third World Championship. It was Prost's actions with the winners trophy in Italy in 1989 that broke Dennis's rule that McLaren had ownership of all trophies won by the team and its drivers, with the drivers free to have replicas made of their race-winning trophies for