One notable incident of the year was at the Monaco Grand Prix, where Senna outqualified Prost by 1.4 seconds and led for most of the race before crashing on lap 67. Instead of returning to the pit lane, Senna was so distressed by his own mistake that went back to his apartment and did not contact the team until he walked into the pit garage as they were packing up later that night. After team manager Jo Ramirez called him through his Monaco apartment's cleaner hours after he had crashed, Senna was still devastated by his own mistake. As the television cameras had not captured his crash, team boss Ron Dennis did not know what had caused his DNF until then, though Prost speculated that judging from the tyre marks, it appeared as though Senna had clipped the inside barrier at Portier, which pitched him into the outside guard rail. At the Portuguese Grand Prix, Prost made a slightly faster start than Senna, but the Brazilian, as he would a number of times- dived into the fast first corner ahead. Prost responded and went to pass Senna at the end of the first lap. Senna swerved to block Prost, forcing the Frenchman to nearly run into the pit wall at . Prost kept his foot down and soon edged Senna into the first corner and started pulling away. Prost, normally a calm individual was angered by Senna's manoeuvre, and the Brazilian got away with a warning from the FIA. At the post-race team debrief, Prost voiced his anger at the move which prompted Senna to apologize to Prost for the incident. Ultimately, the pair won 15 of 16 races in the dominant &lt;a href="McLaren%20MP4/4"&gt;McLaren MP4/4&lt;/a&gt; in 1988 with Senna coming out on top, winning his first Formula One world championship title by taking eight wins to Prost's seven. Prost scored more points over the season, but had to drop three-second places as only the 11 best scores counted, meaning that Senna bested Prost by 3 points.