For Heidfeld his day would see him finish a considerable margin behind Mark after setting a best lap time of 1m:22.728, after completing one hundred and one laps. Nick focused on evaluating the traction control system. For Mark his best lap time was a 1m:20.163 minutes, completing one hundred and six laps.

WilliamsF1 Technical Director Sam Michael commented on the days testing: "Even though the weather was mainly wet today, we completed a combined total of 917kms on the two FW26C interim cars, which is a good achievement at such an early stage with the new rear end. Mark worked on wet tyre testing for Michelin, electronics and reliability running. He was joined today by Nick Heidfeld who did a great job in the other car and also did some work on traction control. Tomorrow, Antonio is driving again with Nick."

Thursday will see Antonio Pizzonia join Nick Heidfeld in testing.

POS. DRIVER TEAM TIME LAPS

1. F. Massa Sauber Petronas 1:19.150 35/59
2. J. Trulli Panasonic Toyota Racing 1:19.257 39/56
3. M. Webber BMW WilliamsF1 Team 1:20.163 50/106
4. E. Bernoldi Lucky Strike BAR Honda 1:20.333 29/48
5. T. Sato Lucky Strike BAR Honda 1:21.701 36/69
6. V. Liuzzi Red Bull Racing 1:21.843 22/48
7. R. Schumacher Panasonic Toyota Racing 1:22.071 34/35
8. L. Badoer Scuderia Ferrari Marlboro 1:22.490 26/63
9. C. Klien Red Bull Racing 1:22.655 27/48
10. N. Heidfeld BMW WilliamsF1 Team 1:22,728 45/101
11. A. van der Merwe Lucky Strike BAR Honda 1:23.686 28/32
12. C. Albers Benson Hedges Jordan-Toyota 1:24.450 33/62
13. M. Gené Scuderia Ferrari Marlboro 1:25.248 33/38
14. R. Doornbos Benson Hedges Jordan-Toyota 1:25.331 48/74
15. A. Carroll Lucky Strike BAR Honda 1:28.831 4/26