Kirton rider Ben Wilson is in hospital in Northern Ireland following a heavy crash in practice at the North West 200.
He had already completed the Supersport and Superbike practice sessions with no problem.
But in the last few minutes of the Superstock session the red flag came out to bring the practice to an early end to enable the medics to attend to Wilson, who had crashed the Aprilia out on the course.
He has a compound break to his femur and was transferred from Coleraine to Londonderry hospital where he underwent a five-hour operation on Tuesday night to clean the wound which will prevent infection.
Wilson is due to have a further operation within the next few days.