The 2005 San Marino Grand Prix (formally the Formula 1 Gran Premio Foster's di San Marino 2005) was a Formula One motor race held on 24 April 2005 at the Autodromo Enzo e Dino Ferrari in Imola, Italy. The 62-lap race was the fourth round of the 2005 Formula One season, and the 25th running of the San Marino Grand Prix. The race was won by Renault driver Fernando Alonso, who extended his lead in the Drivers' Championship after his third win and fourth podium from four races. Michael Schumacher finished the race in second position for the Ferrari team, only two-tenths of a second behind Alonso having challenged him for the win late into the race. BAR driver Jenson Button crossed the line in third place, but his team were subsequently disqualified for underweight cars; third place was then awarded to McLaren driver Alexander Wurz. Pole position was taken by McLaren driver Kimi Räikkönen, using the aggregate system which was in the rules at the start of the 2005 season. He led the race from the start until his retirement on lap 9 due to a driveshaft failure. Alonso took the lead and kept it except during the pit stop phases when it was held by Button, and later Schumacher when he overtook Button. Friday drivers The bottom 6 teams in the 2004 Constructors' Championship were entitled to run a third car in free practice on Friday. These drivers drove on Friday but did not compete in qualifying or the race. Report Background Vitantonio Liuzzi replaced Christian Klien in the second Red Bull car, for this and the next three races; after unanimous agreement between the teams, Klien was allowed to race car #37 for Red Bull in the Friday practice sessions. Alexander Wurz drove the second McLaren-Mercedes car, in place of the injured Juan Pablo Montoya. During the first qualifying session on Saturday, Red Bull announced that they would use Ferrari engines for two years, beginning from the 2006 season. Race Räikkönen led from pole, pulling out a gap of several seconds, before his McLaren retired on lap nine with driveshaft problems. Alonso took over the lead, and was unchallenged until lap 50, when Michael Schumacher emerged from the pits just behind him. Schumacher had started 13th, and had been unable to pass Jarno Trulli for 20 laps, until the Italian pitted allowing Schumacher to increase his pace.