As was the case in Barcelona the team had ideal sunny conditions on this day in which to work through the various items on the test programme. This is the second time in 2004 that the team has used this circuit.

Both Ralf and Marc would spend the day focusing on set-ups for the FW26 in the morning and tyre testing for Michelin in the afternoon. Ralf would complete eighty three laps with a best time of 1m:17.357. Marc would complete seventy one laps, with a best lap time of 1m:17.411.

WilliamsF1 Test Team Manager Tim Newton commented on the days testing by saying: "Ralf and Marc were on hand today to undertake testing duties for our first day at Jerez. Both drivers concentrated on set-up work of the FW26, Ralf in the 03 chassis and Marc in the 02. During the day, they completed some systems checks as well as doing tyre testing with Michelin. Tomorrow Juan Pablo will join Ralf to complete further set-up work on the new car."

Pos Driver Team-Engine Tyres Time Laps

1. Button BAR-Honda (M) 1:16.977 108
2. Sato BAR-Honda (M) 1:17.273 59
3. Montagny Renault (M) 1:17.297 109
4. R. Schumacher WilliamsF1 BMW (M) 1:17.357 83
5. Trulli Renault (M) 1:17.408 102
6. Gene WilliamsF1 BMW (M) 1:17.411 71
7. Raikkonen McLaren-Mercedes (M) 1:17.826 95
8. Webber Jaguar-Cosworth (M) 1:17.890 57
9. Coulthard McLaren-Mercedes (M) 1:17.972 96
10. Badoer Ferrari (B) 1:18.070 109
11. Klien Jaguar-Cosworth (M) 1:18.168 99
12. Massa Sauber-Petronas (B) 1:18.937 63
13. Fisichella Sauber-Petronas (B) 1:19.283 44
14. Heidfeld Jordan-Ford (B) 1:20.109 51
15. Pantano Jordan-Ford (B) 1:21.584 24