Lorenzo was fastest in both practice sessions as the Brno weekend began, but only until Bradl delivered his final 1'56.500 effort to snatch the top spot by three hundredths of a second. Pedrosa trailed Lorenzo by only a further six hundredths, following on from their last-lap battle in 2012.
Valentino Rossi was fourth on the second Yamaha Factory Racing machine, pushing championship leader Marc Marquez (Repsol Honda Team) down to fifth ahead of Monster Yamaha Tech3 duo Cal Crutchlow and Bradley Smith. Completing the top ten were Alvaro Bautista (GO&FUN Honda Gresini) and Ducati Team partners Andrea Dovizioso and Nicky Hayden.
The Ignite Pramac Racing bike was ridden by Michele Pirro, covering for Ben Spies who suffered new injuries in a crash last Saturday, whereas Austria's Martin Bauer made his debut as a wildcard with his privately-entered Remus Racing Team outfit, ending the day 23rd in the 25-rider field. Local Czech favourites Karel Abraham (Cardion AB Motoracing, riding with an injured shoulder) and Lukas Pesek (Came IodaRacing Project) finished proceedings in respective 22nd and 24th spots.
The sole faller of the day was Gresini's Bryan Staring, who lost control of his CRT bike during the morning session. The qualifying running order will be determined at the end of third practice, which will start at 9:55am local time (GMT +2) on Saturday.