MotoGP World Championship leader Casey Stoner has set-up and grip concerns despite qualifying third for Sunday's Grand Prix of Catalunya.

The Ducati Marlboro star will start round six with a four point lead over Fiat Yamaha's Jorge Lorenzo, with Valentino Rossi a further nine points back.

Lorenzo and team-mate Rossi qualified first and second, with Stoner 0.452sec from pole and hoping for last minute progress during Sunday morning warm-up ahead of what he believes will be a 'very interesting' race.

"After yesterday we were quite confident that we knew how to close the gap on the guys in front of us and that is what we expected to do this morning, but it proved to be a problematic session and everything we did made the set-up worse," Stoner revealed.

"The guys worked really hard over lunchtime and during the session this afternoon to change both bikes completely and thankfully we made a big step forward. There is still a bit of a gap to the two riders ahead of us and we know we have work to do, so warm-up will be really important in the morning.

"Nobody really knows what anybody is capable of in conditions like this because once the tyres start spinning it is going to be difficult for any of us to match the times we've been doing today.

"It is going to be a very interesting race and I think everybody is going to be sliding around a lot but the things we tried with the electronics this afternoon should help us in the later stages of the race.

"We'll see what we can do tomorrow but the idea is to dig in and work hard from the warm-up and hopefully we'll still be fighting at the end," he added.


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