Susie Wolff and Felipe Nasr have expressed their frustration at losing precious track time after a coming together signalled an early end to the first day of pre-season testing in Barcelona.

Both drivers had been enjoying productive days when Nasr, who was on a fast lap, was clipped by a slower moving Wolff as he was passing her Williams in the braking zone of turn five.

Sending Nasr's Sauber off the track with rear-end damage, though he was unhurt and his mechanics got him out again for the final minutes of the day, the C34 would go on to stop again just as the chequered flag dropped.

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Similarly, Wolff returned to track late on before hitting an oil pressure issue and being forced to stop again. Indeed, the Scot - who will take no further part in pre-season testing when she hands over to race drivers Felipe Massa and Valtteri Bottas - was disappointed to have her day finished early for what she labelled as a 'stupid' incident.

"For me I stayed completely on my line," said Wolff, who still managed to complete the second largest-number of laps at 86. "I didn't expect him to move as aggressively across as he did and he hit my front-left with his right-rear. It was an unfortunate incident but not something I could have avoided.

"I went over and said 'what the hell went on' and he was a bit speechless. I was a bit speechless as well it was one of those things that happened and you ask what happened."

Showing the assembled media a video of what happened, Wolff rebuffed the idea that she was at fault, but refused to outwardly blame Nasr either.

"I heard some things afterwards that I had apologised, but I certainly didn't apologise because in my mind I had nothing to apologise for. I am not here to say I blame him or he blames me, it just happened. It was a stupid unnecessary thing to happen."

Nasr, meanwhile, played down the clash, saying he thought she had seen him coming and was moving over to allow him through.

"I was on a push lap and I could see her leaving the pits, so she was driving quite slowly in front of me. As I did turn four I caught up with her and I did see her moving to the right, so I thought she knew I was coming.

"Then I committed myself to the braking in turn five on the inside, then when I was braking I felt a big hit on my rear. I think she never saw me coming. I asked her if she saw me and she said no.

"I was clearly in the braking zone already, so a few metres after the braking area and suddenly a felt a big hit. I saw she was enough to the right and giving up room to me, I don't know how much she was aware of me coming."

However, the Brazilian felt his former Williams team should have been alerting Wolff to other cars being around her.

"It is something you have to exercise on a race weekend. You have many cars on track and be aware of who is in front and who is behind, whoever is on a quick lap."