Sauber enjoyed a productive start to the latest pre-season F1 test in Spain after rookie driver Sergio Perez set the second quickest time on day one at Jerez.

The Mexican completed a series of short runs over the course of the day and set his quickest time during the morning, when track conditions were at their best.

Perez did bring out a red flag during the morning when he stopped on track, but with the team having elected to run the C30 out of fuel, technical director James Key insisted there was no cause for concern after a solid opening day.

"Today was a productive day for us," he said. "In the morning we started off with some base line runs. Before we concentrated on set-up and worked on the braking system we also planned to run out of fuel, which was why the car stopped out on the track. In the afternoon we carried out back to back comparisons to learn more about the mechanical set up of the car.

"Although there were several red flags in the afternoon, we have found some good directions for further work. We only used the medium and hard tyre compounds today. In the afternoon we used no more than three sets of the harder ones, and they certainly degrade, but not so badly that we could not learn anything from them. Sergio concluded the day with practice starts and will continue to drive tomorrow."

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