With Rosberg retiring from Formula One at the end of 1986 season, underrated Swede Stefan Johansson filled the McLaren seat alongside Prost for the season. Even though McLaren had introduced the new Steve Nichols designed &lt;a href="McLaren%20MP4/3"&gt;MP4/3&lt;/a&gt; after three seasons with the MP4/2 model (Barnard had departed for Ferrari), the TAG engines were not the force they had been previously, lagging behind in power and with unreliability previously unseen. He never gave up though and challenged Piquet and Mansell almost until the end, winning three races and breaking Jackie Stewart's record for race victories by winning for the 28th time at the Portuguese Grand Prix. “People might not believe me,” said Stewart at the time. “But I’m glad to see Alain take my record. I am glad that he has done it because he’s the one that deserves it. There is no doubt in my mind that he is the best race driver of his generation.” Prost considers his win in the opening round in Brazil as his best and most rewarding race ever. The Williams-Hondas had been dominant during qualifying, and Prost started fifth on the grid with a time three seconds slower than Mansell's pole time. Knowing he didn't have the qualifying speed, he instead worked on his race set-up, and with everyone else going for a high-downforce set-up, he went the other way. The set-up meant less tyre wear, thanks to slower speeds in the corners while going fast down the straights. With his car having less tyre wear than his rivals, Prost was able to get through the 61 laps of the abrasive Jacarepaguá Circuit with only two stops compared to the three or more by his rivals (Piquet pitted for tyres 3 times within the first 40 laps). Prost finished 40 seconds in front of Piquet, with Johansson a further 16 seconds back in third.