Mugello MotoGP: Andrea Iannone's first pole, Marc Marquez out in Q1

The top 11 all set laps quicker than the track record, but it was Iannone who challenged practice three pacesetter Lorenzo - the only man quicker than the record before qualifying - with a time of 1m46.489s.

Andrea Dovizioso was denied second by Lorenzo late on, as Ducati had held the top two positions at its home grand prix before the Yamaha split them.

Iannone, who was diagnosed with an arm fracture earlier this week, hung on to claim his first premier-class pole.

Cal Crutchlow managed an impressive fourth, ahead of the highest of the two Q1 graduates Aleix Espargaro on a Suzuki surrendering substantial straightline speed to the leading manufacturers and while still recovering from his Le Mans injury.

The undoubted crowd favourite Valentino Rossi could only manage eighth, as he enters Mugello leading the championship standings for the first time since 2007.

Marc Marquez fared worse still - down in 13th after failing to reach the final shootout in qualifying for the first time in his MotoGP career.

The Spaniard's problems began when he set a poor time in third practice, which condemned him to joining the Q1 group.

He then fell off at San Donate in practice four just before qualifying, forcing him onto the back-up bike for Q1.

The champion thought he had set a quick enough time to advance to Q2 - only for Yonny Hernandez to put in a session-topping lap while Marquez was sat in the pits watching, demoting the Honda to third in Q1 behind the Pramac Ducati and Espargaro's Suzuki.

Marquez - last year's Mugello winner - has never qualified outside the top six in his MotoGP career, and threw his hat to the floor in disgust as he stormed out of the Honda garage.

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