2008 World Champion Lewis Hamilton has suffered a setback after he crashed in the first pre-season testing session of the year.
Mercedes have revealed that a front-wing problem caused the crash to occur, and are working on fixing the issue ahead of day two in southern Spain.
Hamilton said: "It's unfortunate to end the day early when everyone has worked so hard. But we'll make that track time back and it's better to have these things happen now than in Melbourne."
"The car feels quite good, especially considering it's so early in our programme. Overall it's been a positive day."
Mercedes technical director Paddy Lowe gave his verdict on the incident, admitting it was a shame to run off-track on the opening day after a positive winter of testing.
"To conclude our day's running with a front-wing failure was an unfortunate end to what had, to that point, been a very positive start to our winter," he added.
Ten of the eleven F1 teams are testing in Jerez, and for the first time are encompassing dramatic rule changes which have sparked concerns amongst most teams.
Many of the changes, including those concerning turbo, aerodynamics and much more, will cause reliability issues which are set to plague the whole of testing and may even stretch into the start of the season proper, which begins on March 16th in Australia.
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