The opening practice session for the 2005 san Marino Grand Prix would see the BMW WilliamsF1 drivers, Nick Heidfeld and Mark Webber, finish in eighth and tenth places respectively. The pair would complete sixteen laps.

The session would see Mark and Nick conduct tyre evaluation tests and set-up work.Nick would set a time of 1m:23.086, with Marks time been a lap of 1m:23.532 minutes.

Day one of the 2005 San Marino Grand Prix would see the sun shinning and with Alex Wurz replacing Juan Pablo Montoya at McLaren, and with Christian Klein taking the role of the third driver for the Red Bull team and Viantonio Liuzzi taking the second driving position, the teams would start the opening Friday practice session.

With McLaren's Pedro de la Rosa is the first driver out on the circuit, several other cars would join him, including Toyota's Ricardo Zonta. Minardi would have their new car, including a new Cosworth engine, the PS05. Ricardo would be the first driver to set a time, a 1m:27.717, to go fastest. But his time was quickly beaten by de la Rosa with a 1m:24.994. The session was its normal slow start with very few cars running.

Minardi's Patrick Friesacher's would have his PS05 stop out on the circuit. Red Bull's Christian Klien and Jordan's Robert Doornbos were also out on the track.
Michael Schumacher would come out very early and his first lap would see him set a time of 1m:24.662 to move into second. His next alp would see him improve with a lap of 1m:23.583 to go fastest. Michael would lower his time with a 1m:22.858, after which he would return to his garage. Ferrari has to come up with a good result this weekend after struggling in the opening races.

Friesacher's problems were fixed quickly as he was able to set a time good enough for eighth. Jordan's Narain Karthikeyan was showing a turn of speed setting a t8ime that would see him in fourth, a 1m:25.265.

With thirty minutes of the session run de la Rosa would improve his time with a 1m:23.672, to be 0.8 behind Michael. Sauber's Felipe Massa would move into third with a 1m:24.459. Ferrari's Rubens Barrichello was one place behind him. But Zonta would take back third. Kimi Raikkonen would come out and was on the pace been the fastest in the first two sectors. He would finish with a time of 1m:22.962 to move into second.

Barrichello would spin his car into the gravel at turn one, but was able to get out
and return to his garage. McLaren's Alex Wurz would join Kimi at the front with a 1m:24.049 to see him in fourth. Kimi was consistently fastest in the first two sectors but could not beat Michael's time eventually returning to his pit.

Pedro de la Rosa would show that the McLaren was on the pace setting a time of 1m:21.212, to see him fastest by over a second. Michael would return to the track and would set a time of 1m:22.085, that would see him remain in second. Christian Klien would move into third with a 1m:22.736. With ten minutes of the session remaining we had yet to see the race Toyotas, BAR's and Renaults.

Jenson Button would leave his pit, joined by team-mate Takuma Sato. Ralf Schumacher was also out. Pedro de la Rosa would improve his best time with a 1m:21.060. Button would move into second with a time of 1:21.805, but Zonta would move into that spot with a 1m:21.174. Nick Heidfeld would move into seventh, while Sato was in eighth. Takuma would move into sixth as the session came to an end.