Ben Spies endured a frustrating opening day of practice at the Sachsenring as the American star experimented with different set-up options on his factory Yamaha YZR-M1.

Spies struggled to find an optimum setting in the morning's dry session and his team switched back to a tried and tested set-up for the wet afternoon practice at the German venue, giving the Texan reasons for optimism should the weather remain damp for Sunday's eighth round of the MotoGP championship.

Spies was tenth fastest in the dry and improved a place to set the ninth quickest time in the wet, 0.879s behind Dani Pedrosa.

"This morning was a bit frustrating, we went out to try a couple of things that didn't work, the bike wasn't that bad we just made it a bit too slow," he said.

"We ended up with a decent setting this afternoon when it was wet. I'm not too upset because when it's rained here the last couple of years I've been horrible but this year although we were ninth we weren't that far from the front.

"My feeling with the bike is good if it's a wet race so we'll wait and see if we get a dry session tomorrow."