For Antonio this test would give further time at the Monza track, now that it was announced that he would be replacing Ralf Schumacher for the three days of testing as well as the Italian Grand Prix. The test was conducted in sunny conditions with Juan Pablo working on tyre testing while Antonio focused in testing on aerodynamic modifications as well as brakes.

Both drivers were able to complete the day without any problems with Juan Pablo setting a fastest lap time of 1m:21.649 minutes, while Antonio set a best time of 1m:21.851.

WilliamsF1 Test Team Manager Tim Newton said: "We had some good running today with Juan Pablo and Antonio completing 93 and 83 laps respectively. Both cars were on a similar programme and tested some new aero parts, tyres and brakes. Juan and Antonio will be on duty again tomorrow and Friday. We have more work to do, but we are satisfied with what we have achieved today.”

Pos Driver Team-Engine Tyres Time Laps

1. M. Schumacher Ferrari (B) 1:20.187 77
2. Barrichello Ferrari (B) 1:20.240 90
3. Davidson BAR-Honda (M) 1:21.049 111
4. Sato BAR-Honda (M) 1:21.458 94
5. Montoya Williams-BMW (M) 1:21.649 93
6. Alonso Renault (M) 1:21.702 110
7. Klien Jaguar-Cosworth (M) 1:21.752 59
8. Coulthard McLaren-Mercedes (M) 1:21.826 101
9. Pizzonia Williams-BMW (M) 1:21.851 83
10. Fisichella Sauber-Petronas (B) 1:22.013 90
11. Panis Toyota (M) 1:22.100 87
12. Trulli Renault (M) 1:22.300 65
13. Wurz McLaren-Mercedes (M) 1:22.379 93
14. Webber Jaguar-Cosworth (M) 1:22.381 82
15. Briscoe Toyota (M) 1:22.764 52
16. Pantano Jordan-Ford (B) 1:23.399 77
17. Bruni Minardi-Cosworth (B) 1:23.449 29
18. Leinders Minardi-Cosworth (B) 1:24.441 34