Button bounces back

As the threat of Montoya replacing Button at Williams looms ever larger, the young Brit's composure remained intact. He completed 50 laps during which he posted the fastest time and carried out aerodynamic set-up work in preparation for the Canadian Grand Prix.

The McLaren duo of Coulthard and test driver Panis were close behind Button. Despite being plagued with software problems they managed to finish second and third fastest respectively.

Jos Verstappen put in the fourth fastest time closely followed by Jacques Villeneuve who tested varying aerodynamic set-ups on his BAR 02. Team-mate Zonta, meanwhile had to use the T-car that had been set up for Darren Manning. The Brazilian was hindered by gearbox problems and managed to complete only 10 laps.

All drivers were using a soft to medium Bridgestone tyre - the same compound will be used in Canada.

A testing race awaits Button in Montreal. He must not only prove himself once more on a circuit he does not know, but if he is to maintain his credibility he simply has to out pace his team mate who will likely be Bruno Junqueira standing in for the injured Ralf Schumacher.

1 Button Williams 1m24.06
2 Coulthard McLaren 1m24.67
3 Panis McLaren 1m25.11
4 Verstappen Arrows 1m25.22
5 Villeneuve BAR 1m25.29
6 Frentzen Jordan 1m25.32
7 Diniz Sauber 1m25.56
8 Junqueira Williams 1m25.62
9 Irvine Jaguar 1m26.04
10 Zonta BAR 1m26.26
11 Pantano Benetton 1m26.73