Andrea Iannone set the fastest race lap as he fought from seventh on the grid to a high of fourth during Sunday's Austin MotoGP.

However the Italian, who took his first podium finish during his Factory Ducati debut in Qatar, struggled in the closing laps and was unable to prevent a re-pass by Yamaha's Jorge Lorenzo.

"I set the fastest lap but I didn't finish on the podium and I'm sorry for us," Iannone said. "I tried by best but my first lap was really difficult because Scott Redding crashed in front of me.

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"I pushed hard in the first five or six laps to close the gap to the first riders and it's good for me when I arrive close to Vale and Dovi. I fight a little bit with him. But in the last six laps it was not possible to push more because the feeling was less and the bike is different so I finished [behind Lorenzo].

"I'm really happy for my fight in the race, but not my result because I want more. I think the bike has good potential. It is a really good bike this year and I want to reward all the people working on this project. But ok, step-by-step I'm improving every time and for the next race we will be better."

Iannone and Dovizioso both parked their Desmosedici GP15s shortly after the chequered flag having apparently run out of fuel. The #29 said he hadn't felt a loss of power in the closing stages.

"No I think there was enough fuel inside to get to the end, then the bike stopped after the first corner, but ok the engineers will check."

MotoGP now heads straight to Argentina where Iannone was the top Ducati rider in 2014.

"Argentina is a really good track for me. Last year I finished sixth and was the first Ducati, so I have good memories. I think with the GP15 it is possible to do better. We will see what happens."