Martin was braking down from 120mph to 70mph when he slid off onto the grass on his 1000cc Honda.
Unhurt, he quickly picked himself up but that was the end of his session.
Manx rider Conor Cummins will be in Superstock pole for Saturday’s race after clocking the fastest speed of the opening session at 117.149mph, followed by Ryan Farquhar on 116.452 and Scot Keith Amor on 116.236.
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