De Angelis was replaced at Lotus by Scotland's Johnny Dumfries after Senna vetoed Derek Warwick from joining the team, saying that Lotus could not run competitive cars for two top drivers at the same time. Senna allegedly pushed for his former flatmate and fellow Brazilian Maurício Gugelmin to join the team as a pure number two driver, but the team's major sponsor John Player &amp; Sons (JPS) insisted on a British driver which led to the signing of Dumfries. Senna later admitted "It was bad, bad. Until then I had a good relationship with Derek." Senna started the season well, coming second in Brazil behind the Williams-Honda of fellow countryman Nelson Piquet, and winning the Spanish Grand Prix by just 0.014s from Piquet's teammate Nigel Mansell in one of the closest finishes in Formula One history to find himself leading the World Championship after two races. Although the 98T was like the 97T before it quick car with superiority on tight, bumpy circuits- poor reliability, particularly in the second half of the season, saw him drift behind the Williams pairing of Mansell and Piquet, as well as defending and eventual champion, Alain Prost. Nonetheless, Senna was once more the top qualifier with eight poles, with a further six podium finishes included another win at the Detroit Grand Prix, thus finishing the season fourth in the driver's standings again, with a total of 55 points. The 1986 F1 cars were the most powerful cars in history, with Senna's 98T producing over in qualifying and in the race.