Former MotoAmerica Supersport regular Valentin Debise was quickest during FIM Supersport World Championship Free practice Friday morning at Autodrom Most, in Czech Republic. Riding his Eastroc Evan Bros ZXMOTO 820RR on Pirelli control tires, the Frenchman covered the 2.61-mile (4.21 km) road course in 1:34.389, topping the field of 33 riders.

Can Oncu was the best of the rest with a 1:34.719 on his Pata Ten Kate Yamaha YZF-R9.

Ondrej Vostatek was third with a lap time of 1:34.753 on his Compos Racing Triumph Street Triple 765 RS.