Monster Yamaha Tech 3's Pol Espargaro finished as the leading satellite rider in final qualifying for the Aragon MotoGP to head up row two of the grid.
Espargaro set his best time in 1m 47.334s as he finished slightly more than a tenth of a second behind Ducati's Andrea Iannone on the YZR-M1, equalling his best qualifying position of the season.
The 2013 Moto2 world champion was boosted by his performance although Espargaro did encounter grip problems with the rear in FP4.
“Fourth position is definitely a positive end to today's qualifying and it is a promising starting point for the upcoming race,” he said.
“Yet, it hasn't been an easy day as we had to face some difficulties with a lack of grip during FP4 when I ran on a used rear tyre. Afterwards, during the qualifying with the two new rubbers, the conditions changed completely and I felt much more confident.
“I was searching for the limit a bit during my first run and then I gave it everything I had on the second tyre and the final result is really pleasing,” added the 24-year-old.
“This is even more important as the first corner here is a bit dangerous and some other turns in the opening sector are tricky regarding the braking at the start of the race, so it's truly positive to be able to kick off proceedings from the front of the field.”