The 27-year-old Pole, ranked world No. 8 by the Association of Tennis Professionals (ATP), dispatched O’Connell 7-6, 6-4 in the round of 16 on Wednesday.
The third-seeded Polish player will now take on France's fifth-seeded Ugo Humbert for a place in the semifinals.
Hurkacz is playing for his eighth career singles title in Dubai.
The hard-court tournament runs until Saturday.
(gs)
Source: PAP