Fernando Alonso was quickest for Ferrari in a disrupted second practice session in Canada.
Sebastian Vettel bounced back from his crash in the first session in the best possible way – by jumping straight to the top of the times shortly after leaving the pits.
He was relegated from the top of the times by Alonso, still using the soft tyres, who edged his time by a quarter of a second.
Alonso went on to almost matched Lewis Hamilton’s pole position time from last year, with a 1’15.107.
However a spate of accidents thwarted the teams’ attempts to test the super-soft tyres.
Adrian Sutil was one of the first drivers to try the super-soft tyres, but his effort came to an end when he hit the barrier at turn seven.
His car was recovered under yellow flags. But a few minutes later Kamui Kobayashi did a more comprehensive job of damaging the Sauber, causing the session to be stopped.
He hit the wall heavily at turn four, causing a lot of damage to the right-hand side of the Sauber.
When the session was restarted 15 cars left the pits at once, with Jerome d’Ambrosio among the first of them. But on his first flying lap he crashed at the same place Kobayashi had, causing another red flag.
Meanwhile Lewis Hamilton limped back into the pits with a right-rear puncture, possibly caused by debris from the accident.
After another hiatus the session resumed with a quarter of an hour left on the clock.
With most drivers now having made several aborted attempts to set times on super-soft tyres, few of them ran the tyres at the end of the session.
One driver who did was Paul di Resta, who set the sixth-quickest time.
Another was Pedro de la Rosa, he spent most of the session being fitted into Sergio Perez’s Sauber and only appeared in the final half-hour.
2011 Canadian Grand Prix
Image © Ferrari spa/Ercole Colombo