Dubois floored Harper with a jab and left hook in the sixth round, turning a slow first half into a decisive victory. The judges scored 98-91, 97-92, 98-91, giving Dubois the WBO belt in addition to her WBC title.
The bout, held at Olympia in London, marked the first UK show by Most Valuable Promotions and saw Dubois extend her record to 13-0-1. Harper, a three‑weight champion, finished with 16-3-2 after the cut from a head clash in the eighth round.