125: Marquez falls hard in Brno practice, Terol top

125cc World Championship leader Marc Marquez, winner of the last five races, has been sent for medical checks after injuring his arm during a highside at the end of Friday practice at Brno in the Czech Republic.

Marquez - leading the championship by 26 points over Pol Espargaro - finished the session in third for Red Bull Ajo Derbi, behind the Aspar Aprilias of Nicolas Terol and Bradley Smith.

UPDATE: Marquez has been diagnosed with a dislocated shoulder.

Former world championship leader Terol made a remarkable return to action, after missing the previous Sachsenring round due to back injuries sustained in Catalunya, to lead the session by 0.507sec from his British team-mate.

After a slow start, Espargaro rose to fourth fastest for Tuenti Derbi, 0.812sec behind Terol.

Friday practice - Brno:

1. Terol (Aprilia) 2m 8.010s
2. Smith (Aprilia) +0.507s
3. Marquez (Derbi) +0.788s
4. Espargaro (Derbi) +0.812s
5. Rabat (Aprilia) +1.444s
6. Webb (Aprilia) +1.815s
7. Krummenacher (Aprilia) +1.848s
8. Cortese (Derbi) +1.912s
9. Vazquez (Derbi) +1.928s
10. Zarco (Aprilia) +1.974s