Dani Pedrosa blitzed the field and lapped more than half a second faster than any of his MotoGP rivals in the final practice session at Brno.
The Spaniard, bidding to close his 18-point deficit to championship leader Jorge Lorenzo, moved to the top of the timesheets early on and was never displaced.
With a quarter of an hour to run Pedrosa pulled over half a second clear of the field, before he stamped home his dominance with a 1m56.209s at the flag - just over one tenth shy of the fastest ever lap at the circuit and more than seven tenths faster than anyone else could manage.
As if to underline Pedrosa's control, Lorenzo also set his fastest lap at the flag but wound up 0.806s down.
The championship leader was then demoted to third by Yamaha team-mate Ben Spies.
Tech 3 Yamaha duo Andrea Dovizioso and Cal Crutchlow were the last men to get within one second of Pedrosa, with less than three hundredths of a second to choose between them.
Karel Abraham on the satellite Cardion Ducati rose to ninth late on, ahead of Aspar CRT duo Randy de Puniet and Aleix Espargaro.