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2013 Canadian Grand Prix practice session photos Photo 86 of 107

Force India's Paul di Resta was the surprise pacesetter in an opening practice session at the 2013 Canadian Grand Prix on Friday that was marked by continually changing track conditions.

Circuit Gilles-Villeneuve, Montréal, Québec, Canada  FIA Press Conference (From back row (L to R)): Stefano Domenicali, Ferrari General Director; Christian Horner, Red Bull Racing Team Principal; Martin Whitmarsh, McLaren Chief Executive Officer; Monisha Kaltenborn, Sauber Team Principal; Ross Brawn, Mercedes AMG F1 Team Principal. Auto123.TV 2013 Photographer: | © auto123.com