Andrea Iannone hasn't given up on fourth place in the MotoGP World Championship after the Ducati rider was forced to retire from the Malaysian Grand Prix.

Iannone's GP15 sustained a holed radiator at the start of the race and the Italian was forced to pull out on lap two.

It was his second DNF in the three fly-away races and Iannone has now dropped to fifth in the points standings behind Repsol Honda's Dani Pedrosa, who won at Sepang to seize a maximum haul of 50 points.

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However, with only two points separating the pair, the Ducati star has vowed to give his all in the final race to peg back Pedrosa.

"I'm really disappointed because for the second time this season I had a problem with the bike at an important moment for me, seeing as I am fighting for fourth place in the championship," he said.

"Here there was a chance of doing a good race, because in the warm-up the bike was going well. Probably at the start a rider ahead of me threw up a stone, which hit and holed the radiator.

"For sure it's not an ideal situation to go to Valencia two points down on Pedrosa: it will be tough to fight for fourth place, but that remains my goal and I will try my hardest to achieve it."

Ducati's misfortunate at Sepang was compounded when Andrea Dovizioso crashed out of the race following contact with Cal Crutchlow as the pair disputed fourth.