The 24-year-old Swansea Harrier, who is the Welsh 100 metres champion, will be off a rookie mark of three metres for his first bid to win the £4000 first prize. Roberts will give away a start of 2.5m to Greg Turnbull (Jedburgh), a previous runner-up. Scottish Commonwealth Games 400m runner Gemma Nicol (Dunfermline) is the leading woman off 17.50m.