Championship leader Brad Binder finished third last year at the Czech GP – his first podium finish at the Brno circuit.
Enea Bastianini finished second at Brno two years ago, one of three podium finishes he achieved in his rookie season in grand prix racing. He repeated the second place finish at Brno last year, having qualified in 15th place on the grid.
Niccolo Antonelli qualified on pole and won the Moto3 race last year at Brno, the first time he had stood on the top step of a grand prix podium.
Romano Fenati set a new Moto3 lap record two years ago at Brno on his way to finishing in eleventh place, just 1.042 seconds behind race winner Alexis Masbou. Last year he finished 6th at Brno after starting down in 22nd place on the grid, but now faces an uncertain future after being dropped by the Sky Racing Team VR46.
Joan Mir qualified on pole and took his first Moto3 win in Austria, having never previously qualified on the front row or finished higher than 5th in his rookie season in grand prix racing.
Fabio Quartararo was fourth in Austria – his best result since he finished fourth at Silverstone last year.