Red Bull KTM Ajo Kalex rider Pedro Acosta was quickest in Moto3 Practice One Friday morning at Silverstone with a lap time of 2:05.399.
American Joe Roberts was ninth in the session with a 2:06.027 on his Italtrans Racing Kalex.
Just one second covered the top 12 riders in the session.
American Joe Roberts is not riding this weekend at Silverstone while he continues to recover from surgery on his right forearm.
