Andrea Iannone finished as the leading Ducati rider in the opening practice sessions at the Dutch MotoGP in an impressive fifth place.

The Pramac rider lapped in 1m 34.277s to slot in behind Movistar Yamaha's Jorge Lorenzo and was 0.624s behind fellow Open class rider Aleix Espargaro, who topped the times on the Forward Yamaha.

Iannone, though, was experiencing some problems at T1 and T4 and is aiming to make progress on Friday to improve his pace in these sectors.

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"I am losing time in T1 and T4; I don't know [why], I will check later with my technicians and I will try and improve for tomorrow, but T1 and T4 now is my bad sector," he said.

"The bike has a good feel and is very strong in the change of direction, but to slide the bike in the corner is very difficult. I pushed very hard with the soft tyre and did my best for this practice and my performance was not so bad."

Iannone, meanwhile, hopes to have a clearer picture of his future with Ducati by the end of July.

"I don't know the situation [over continuing with Ducati in 2015] - it's too early now but I want a resolution by the end of July," he said.

His team-mate, Colombian Yonny Hernandez, finished in 14th overall after FP1 and FP2 at Assen, one place behind Cal Crutchlow, with a best lap of 1m 35.537s.

"For me it was a little bit more difficult today with the track; I had more problems compared with the last race but it's not so bad and I think for tomorrow I can improve a little," said Hernandez.

"The handling of the bike is too heavy to go from one side to the other side."