Ben Spies was unable to fulfil his early promise at Aragon as he succumbed to the challenge of satellite Yamaha pair Andrea Dovizioso and Cal Crutchlow.
Texan Spies made a strong start to the race to move into third at the first corner behind MotoGP title challenger Dani Pedrosa.
He was soon passed by Stefan Bradl, but the LCR Honda ace immediately crashed out leaving Spies holding third.
The Factory Yamaha rider soon came under increasing pressure from Tech 3 Yamaha duo Dovizioso and Crutchlow, but slipped back on lap 14 as Dovi powered through before Crutchlow followed suit on the 17th lap.
Spies, who holds 10th position in the championship on 88 points, said he was “struggling” with the front tyre of his M1 at Aragon.
“I struggled a bit with the front tyre today at the beginning and then in the middle of the race,” he said.
“I tried to keep Dovi and Cal at bay as long as I could. Once they passed me I tried to hold on to the back of them in case they made a mistake.
“The bike was working well we just didn't have it working as exactly as we needed to stay with them,” he added.
“We did our best [but] they were just too quick in the end.”