Fresh from his Indianapolis victory, MotoGP title contender Dani Pedrosa led both Friday practice sessions at Brno in the Czech Republic - despite a scare in the morning session.
The Repsol Honda rider was struck by stones kicked up by the rear wheel of Valentino Rossi's Ducati.
The impact smashed the front screen on Pedrosa's Honda and stones also hit his helmet and left foot, leaving the Spaniard limping after the impact.
The session was later red flagged to clean the debris after Alexi Espargaro was also struck.
“I was pretty lucky with the incident this morning as it could have been a lot worse,” said Pedrosa. “There were two massive rocks that flew up, one hit my left foot hard and the other one hit my screen and chin.
“At the beginning I thought I had broken something in my foot but fortunately it's ok, just a lot of swelling, anyway the pain is going down from this morning so that's a good thing.”
Pedrosa led the morning session by 0.146s from title leader Jorge Lorenzo and again dislodged the Yamaha rider from the top in the afternoon outing, which Pedrosa finished just 0.053s clear of his fellow Spaniard.
“Today we spent time working on the tyres and set up of the bike,” he said. “We were trying to get the maximum time on the track as tomorrow we don't know how the weather will be so it was important to have a lot of time in the dry.
“The feelings were improving but we still have some work to do especially with electronics and suspension.”
Pedrosa trails Lorenzo by 18 points with seven rounds remaining. Pedrosa's team-mate and reigning champion Casey Stoner has withdrawn from the event, and world title battle, to undergo surgery on his injured ankle.