It's practice time again, and although the Pirelli and Mercedes "secret" test is still hanging over our heads, focus can return to the track action once more. The Montreal circuit has one of the less structurally sound track surfaces, and the tyre wear across the Circuit Gilles Villeneuve may be something to see. With medium and supersoft tyres, plus some special Friday practice compounds, the teams need to really make the most of their practice time - although there's some epic rain predicted for them to contend with.