Sebastian Vettel has revealed that a gearbox issue cost him a bit of time in Friday's practice, throwing him off his rhythm.
The four-time World Champion managed just 26 laps in Montreal on Friday afternoon while several drivers, including pace-setter Lewis Hamilton, amassed 40 or more.
The lost track-time meant Vettel's programme for the afternoon was different to most and the German was the last to put in a supersoft tyre run.
That lap saw him improve from P15 to P4 while a slightly better lap, a 1:16.573, meant he finished the afternoon in third place.
The German, though, reckons there is more to come.
"It was a bit of a shame to lose some laps; we had something with the gearbox, but fortunately we got it checked and went out again," he said.
"It meant that we were maybe a bit off the rhythm compared to some of the others, but it seemed to be alright and we still got some good laps completed.
"I think there's still a lot if improvement we can do, the Mercedes is very quick, but it was okay as a start to the weekend."