After a delayed and curtailed opening practice due to CCTV system issues at Montreal's Circuit Gilles Villeneuve, practice properly got under way in the second session which was extended to 90 minutes to make up for the lost running.
Hamilton led a Mercedes 1-2 from team-mate George Russell, profiting from a later soft tyre run compared to rivals, before a heavy rain shower hit the track in the final five minutes of FP2.
