Bradley Smith ended the opening day of 125cc practice at the head of the timing screens with the Englishman just ahead of championship rivals Marc Marquez and Nico Terol.
First practice pace setter Efren Vazquez and Pol Espargaro were the only other riders to finish the day within a second of Smith’s lap. The Tuenti Derbi riders will be keen to finish their season on good form.
The top ten was completed by Cortese, Martin, Rabat, Zarco and Salom. The session started with a bang when Tommaso Gabrielli crashed heavily after only a handful of laps.