Sergio Perez was brimming with confidence after his recent breakthrough race successes, and said that he was happy and confident at the end of Friday's practice sessions at the Bahrain International Circuit at Sakhir.

"I am happy about having had a good Friday and I am very satisfied with the work we have done," declared the Sauber driver at the end of the day. "We still need to sort out a few set-up issues for qualifying, but I am very confident for tomorrow."

In particular, Perez seemed alone in thinking that he and his team were on top of the tear wear issue that was plaguing other teams down pit road.

"We have learnt a lot and we managed the tyre degradation on the rear, which everybody has problems with, quite well," he said. "To me this was a very positive day."

His team mate Kamui Kobayashi was less upbeat about the day, however.

"Technically we had no incidents, but we are struggling on tyre temperatures," said the Japanese driver. "The lap times on the soft tyres in the short run didn't look too bad, but for qualifying there is still some work to do.

"Even more improvement is necessary for the long runs and for me this goes for both tyre compounds, soft and medium," he added. "We will evaluate the data now and see what we can do better for tomorrow."

"We found a reasonable balance," said a cautious Giampaolo Dall'Ara, Head of Track Engineering for Sauber F1. "As we expected, the heat makes it difficult to keep the tyres consistent, but this seems to be a common issue for most of the cars."

He added that the two sessions had been "okay" and that the team had been able to complete the whole of the intended practice test session programme.

"Now we have to work for the race," summed up Dall'Ara.