Practice One - Di Resta tops damp Montreal opener

Force India's Paul di Resta was the surprise pacesetter in an opening practice session in Canada on Friday that was characterised by continually changing track conditions. Rain in the morning left the Circuit Gilles-Villeneuve wet enough for Pirelli's intermediate tyres right up until the closing minutes. Several drivers set the pace as the track evolved, until right at the end Di Resta was the quickest man to switch to the medium slicks

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