Marcus Ericsson admits he regrets some missed opportunities from the first half of the season with Sauber.

With Ferrari delivering a major step forward with its power unit, Sauber was very competitive at the start of the year and scored points with both cars in Australia. 10th place in Hungary last weekend was just Ericsson's sixth point of the year, however, as the car has become less competitive and the Swede is left rueing some missed chances in the early races.

“I think it’s been a decent season so far, keeping in mind the team’s performance in 2014," Ericsson said. "We had a good season-opener, finishing with both cars in the points. Obviously, in the last few races we were all a bit disappointed as we lost momentum. Overall, we have done a good job so far, but, of course, we want to score more points.

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"For myself I think I have learned a lot. Coming to a more experienced team was a big step up for me. I am satisfied with my performance so far, but there are some missed opportunities that I regret. That’s how it is sometimes, but I learn from these moments. There is always room for improvement, and I will push to become better.”

One specific race Ericsson highlights is in Malaysia where he missed out on what could have been a strong points finish.

“I had a good weekend during the Malaysian Grand Prix, being in the top ten in every session. In the race it went the other way. When I was attacking for P7, I retired in the gravel while I was trying to overtake. It was a shame, as the weekend had gone well up to that moment. It was a missed opportunity, which is part of the learning curve.”