Ducati's Andrea Iannone expects to return stronger following the completion of the MotoGP summer break at Indianapolis in the USA after 'three difficult tracks' for the GP15.

Iannone finished a safe fourth on Sunday at the Sachsenring in Germany to maintain his third place in the championship, but is now just four points ahead of race winner Marc Marquez.

The Italian finished the race 20 seconds behind the Repsol Honda rider and said he was losing three tenths a lap to the top riders at the Sachsenring.

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"It was a little bit difficult weekend because the feeling with the bike is really difficult, especially in the ten left corners. My bike didn't have good grip on the angle and in T2 I'm losing three tenths compared to the best riders," said Iannone.

"Together with my team I tried the maximum. I pushed really hard. We worked and changed many settings to try and improve the situation, but I don't improve a lot.

"This morning I tried to change a little bit my style for help a little bit this situation, but also I don't have a solution for this. But I'm sure in the future in Indianapolis the situation will improve," he added.

"I think these last three races have been difficult tracks, especially the layout, for the GP15. But in the first part I'm happy a little bit for this, because the engineers understand really well, really good, in the beginning the problem."

Iannone is optimistic the Ducati will improve further in the second part of the season as he aims to close the gap to the front.

"Yes the gap to the leader was 20 seconds but the gap to Jorge [Lorenzo] was closer, 10 seconds, and I think this weekend Marquez made the difference," he said.

"I hope in the future, in Indianapolis and for the second part of the season, to improve this situation and to close the gap. I'm optimistic.

"And the focus now is to improve the situation for the second part of the championship."

The Ducati featured new winglets in Germany and Iannone revealed they were specifically designed for the Sachsenring.

"The new winglets didn't change anything with the braking and they were only for this track," he said. "They were only for Sachsenring."