Nuria Parrizas Diaz upset favoured Beatriz Haddad Maia 7–6, 6–2 in the first round of the Australian Open on hard court on 18 January 2023. Despite entering as the clear pre-match favourite at odds of 1.21, Haddad Maia struggled to impose her game, particularly in the opening set, which Parrizas Diaz secured in a tiebreak. The Spanish player then dominated the second set, breaking serve decisively to close out the match and secure an upset victory. The result marked a significant scalp for Parrizas Diaz and an early exit for Haddad Maia from the year's opening Grand Slam.