WilliamsF1 improves in opening Saturday practice

At the front it would be BAR's Jenson Button who would finish the fastest. He would set a time of 1m:29.485. He would be 0.707 seconds ahead of Ralf.

Also showing his continued good form was Button's teammate Takuma Sato in third. With Juan Pablo Montoya fourth Ferrari's Michael Schumacher was forced down to fifth.

Both Schumacher brothers were to have moments during the session when they ran wide. Friday's fastest driver Kimi Raikkonen finished sixth ahead of the Renault pair Jarno Trulli Fernando Alonso.

Rubens Barrichello finished ninth fastest while Frenchman Olivier Panis completed the top ten in his Toyota, finishing 1.763 seconds off the lead pace. For McLaren's David Coulthard he would fail to set a time.

It was announced that Jaguar's Mark Webber will have one second added to his fastest qualifying time today, as penalty for ignoring yellow flags in yesterday's free practice session, while Felipe Massa's Sauber was being removed from the track.