Fernando Alonso has predicted it will be 'a very complicated' weekend at Montreal's Circuit Gilles Villeneuve given the weather conditions are due to remain changeable.

The Spaniard made a strong start to the seventh round in the 2013 F1 World Championship, and was fourth in the wet opening practice session. He then went quickest in the afternoon, just edging out the Mercedes of Lewis Hamilton to take the day one honours.

"It was an untypical Friday, affected by the extremely changeable weather. We didn't manage to complete our programme because the track was wet in the morning and so only tomorrow will we find out if the updates we tested here produce a real performance evolution," Alonso said.

"It was very important that we try them just as it was also important to try the new Pirelli tyres. Felipe [Massa - my team-mate] and I made different choices for the long runs and this is another reason why we will have to wait for the outcome of qualifying to understand more.

"The only certainty is that we must ensure we make the right decisions, because today we saw how getting a clean lap depends a lot on the time you make the decision and what track conditions are like at that moment.

"We can expect a very complicated weekend, because the weather is due to remain changeable right up to Sunday and judging the grip level will be difficult, both in qualifying and in the race."

Massa meanwhile was eleventh in FP1 and sixth in FP2 and he also reckons the weather will be the pivotal factor: "Today, it was a case of working for just half a day, because in the morning, the rain meant we could only do a small number of laps," he added.

"Therefore, the bulk of the work, given over to evaluating the tyres and new parts brought for this race, had all to be squeezed into the afternoon session. Now we will have a busy time analysing all the data we gathered to try and understand which of the updates could be used in the next couple of days. If it does not rain tomorrow, then the track conditions will be completely different and that means we must be ready to tackle whatever situation could arise".


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