Despite the conditions the team would make use of them to further test tyres from tyre supplier, Michelin. The team would continue to test new wet weather tyre designs and compounds. The team also took the opportunity to test various wet weather set-ups.

Both drivers would see the conditions limit their track time but Montoya would end the day with the fifth fastest time while Gene was in ninth.

Juan Pablo would complete fifty laps, with a best time of 1m:27.397. He would work through various tyre designs and compounds. For test driver Marc Gené he would set a best lap time of 1m:28.600. Marc was involved in further testing of the teams new gearbox.

WilliamsF1 Chief Operations Engineer Sam Michael commented on the days testing by saying: "It was wet all day today which enabled us to concentrate on intermediate and wet tyre testing with Michelin. We also worked on various traction control and other electronic set up items.

Juan Pablo did the tyre testing and Marc continued system checks with the new engine and gearbox. Juan Pablo Montoya and Marc Gené will both be undertaking testing duties again tomorrow."

Pos Driver Team-Engine Tyres Time Laps

1. Davidson BAR-Honda (M) 1:26.256 47
2. Massa Sauber-Petronas (B) 1:26.892 22
3. Barrichello Ferrari (B) 1:27.003 10
4. Sato BAR-Honda (M) 1:27.199 18
5. Montoya Williams-BMW (M) 1:27.452 50
6. Montagny Renault (M) 1:27.775 25
7. Webber Jaguar-Cosworth (M) 1:27.885 43
8. de la Rosa McLaren-Mercedes (M) 1:28.483 26
9. Gene Williams-BMW (M) 1:28.663 28
10. Alonso Renault (M) 1:28.705 7
11. Panis Toyota (M) 1:29.627 35
12. Klien Jaguar-Cosworth (M) 1:30.564 41
13. da Matta Toyota (M) 1:31.398 31
14. Wurz McLaren-Mercedes (M) 1:32.385 9