Aprilia gave its rivals something to think about ahead of today's World Superbike races at Phillip Island as Max Biaggi and Leon Camier rose to the top of the timesheets during warm-up.

Having qualified down in 11th and 16th positions respectively, Biaggi and Camier have their work cut out during the races, but in clear air they were marginally faster than front row sitters Leon Haslam, Michel Fabrizio and Cal Crutchlow.

James Toseland was sixth fastest on the second Yamaha, ahead of Jonathan Rea and Noriyuki Haga, although the Ducati man completed just four laps after a collision with Ruben Xaus.

Leaving both BMW and Ducati Xerox teams with plenty of repair work to do before the opening race, Haga's bike is currently undergoing a full rebuild.

Shane Byrne was another to take a tumble during the session.

Meanwhile, the field will be reduced to 23 riders for today's races following the withdrawal of the injured Roland Resch.