Harrison achieved a historic championship victory in the Southern 100.
Dean Harrison won all four races at the Southern 100 to claim his fourth championship title, also setting a new absolute lap record on the 4.25-mile Billown circuit.
Hickman competed in the Southern 100 at Billown wearing a rookie vest.
TT absolute lap record holder Peter Hickman completed his first official ride at Billown Circuit on Monday evening wearing a rookie vest; he then placed 10th in the Supersport category in his first qualifying session.