With Jonathan Palmer having retired from driving at the end of 1989 and a new teammate in Satoru Nakajima, Alesi amazingly became Tyrrell's lead driver in 1990 for what would be his first full year in Grand Prix racing (prior to the start of the 1990 season, Alesi only had 8 race starts in Formula One). At the first event, the United States Grand Prix at Phoenix, he led for 25 laps in front of Ayrton Senna with a car powered by a customer Ford V8 considered as vastly inferior to the V10 Honda in Senna's McLaren, and also re-passing Senna after the Brazilian had first overtaken for the lead. Second place in the Monaco Grand Prix followed the second place gained in Phoenix, and by mid-season, top teams were clamouring for his services in 1991. A confused situation erupted, with Tyrrell, Williams, and Ferrari all claiming to have signed the driver within a very short period. The results dropped away during the rest of the 1990 season, and Alesi finished ninth in the championship, with 13 points.