Sabalenka broke for 1-0 and again for 2-1, then broke for 5-2 to seal it 6-2, with Gibson's sole break for 1-1 a brief interruption.
Sabalenka broke for 6-5 but Gibson broke back for 6-6 in a 12 minute deuce game, then Sabalenka won the tiebreak after 72 minutes of relentless holds.