Jorge Lorenzo capitalised on championship leader Marc Marquez's crash to claim his first MotoGP victory of the season at a rain-affected Aragon Grand Prix.
Lorenzo's decision to switch to dry tyres as rain eased proved pivotal, with Marquez and fellow title contender Dani Pedrosa both falling after spurning a change.
Aleix Espargaro finished second with Britain's Cal Crutchlow third, while Yamaha's Lorenzo secured his first victory since 2013's final race.
Spaniard Marquez finished 13th, one place ahead of rival and compatriot Pedrosa - leaving him still able to extend his overall championship lead by a point.
Seven-time world champion Valentino Rossi crashed out of the race in the early stages, before the rain had even started.
The Italian won his first MotoGP in 15 months two weeks ago on his home track in San Marino.
Rossi was carried from the track on a stretcher but was later able to stand and is not thought to have suffered serious injury.
