Spain's MotoGP world championship leader Jorge Lorenzo has dominated practice for the Czech Grand Prix.
He clocked a best time of 1 minute 57.215 seconds, 0.541 seconds faster than compatriot Dani Pedrosa.
Australian Casey Stoner was seventh on his Ducati with 1:58.532.
The Yamaha rider Lorenzo, who has won six of the nine races so far, takes a 72-point lead over Honda's Pedrosa into Monday's event, which kicks off the second half of the season.
