The 1990 United States Grand Prix was the opening motor race of the 1990 Formula One World Championship held on March 11, 1990, in Phoenix, Arizona. It was the 32nd United States Grand Prix since the American Grand Prize was first held in 1908, and the 25th under Formula One regulations since the first United States Grand Prix was held at Sebring, Florida in 1959. It was the second to be held on the streets of Phoenix and ran over 72 laps of the 4 km-circuit. The race was won by Brazilian Ayrton Senna, driving a McLaren MP4/5B by eight seconds over French driver Jean Alesi in his comparatively under-funded Tyrrell 018. Throughout the race, the pair enthralled fans with some fabulous and daring passing for the lead. It was Alesi's first podium finish, with Belgian driver Thierry Boutsen in a Williams FW13B coming home third. Background The United States Grand Prix in the dry desert city of Phoenix was moved to the start of the season in March to avoid the intense 100+ °F heat the city experiences in summer, although the previous year's race was run in June because it was given at such short notice. Swiss driver Gregor Foitek made his Formula One race debut for the Brabham team. He had attempted to qualify for races during the 1989 season, failing to make the grid in eleven qualifying attempts for EuroBrun and one for Rial. Qualifying Pre-qualifying report Several teams were required to participate in the Friday morning pre-qualifying sessions during 1990, in order to reduce the field to thirty cars for the main qualifying sessions on Friday afternoon and Saturday. At the midway point of the season, the pre-qualifying group was to be reassessed, with the more successful, points-scoring teams being allowed to avoid pre-qualifying, and unsuccessful teams being required to pre-qualify from mid-season onwards. Nine cars were required to take part in pre-qualifying sessions during the first half of the 1990 season, reduced from thirteen at the end of the 1989 season. The disappearance of the Zakspeed and Rial teams reduced the numbers, as did the reduction of the Osella and Coloni teams from two cars each to one car each. In contrast, EuroBrun expanded from one car to two, and were joined by the only new team on the entry lists, Life Racing Engines, who ran a single car. The fastest four cars would