Huddersfield had taken a third-minute lead through Rod Jensen but Bradford took an eight-point lead with Harris slotting over his fourth goal on 36 minutes.
Playing earlier with the roof open, unseeded Suarez Navarro looked shell-shocked in the conditions as Dementieva raced to a 4-0 first-set lead on the Rod Laver Arena.
Mr Bourne, the former Tory Welsh spokesman and former leader of the anti-devolution No campaign, was defeated by Rod Richards in his bid to lead the Welsh Tories.