Maserati was a successful Formula One chassis manufacturer in the 1950s, supplying several teams and winning numerous races. In Juan Manuel Fangio won the drivers' title in a Maserati 250F, his fifth and final championship win. The team officially withdrew from the sport at the end of the year but many of the cars remained, being driven by privateers. On 18 May 1958 de Filippis was given the opportunity to enter the Monaco Grand Prix, the second round of the 1958 Formula One season, in one of the 250Fs. Of the 31 entrants only half set a time good enough to qualify, with de Filippis missing out alongside fellow debutant and future Formula One Management and Formula One Administration president Bernie Ecclestone. De Filippis's time of 1'50.8 was 5.8 seconds behind the qualifying time of the fastest 16 which included future world champions Mike Hawthorn, Jack Brabham, and Graham Hill in his first race. Fangio gave de Filippis plenty of advice during the season. In a 2006 interview she recalled that Fangio told her, "You go too fast, you take too many risks."