Timea Bacsinszky has beaten Sam Stosur 5-7 6-4 6-3 at the Sydney International.
The Swiss player took full advantage of Stosur's mistakes with her more accurate and clinical game.
It was a day which had provided sunshine, but also windy conditions, and after a slow start, Stosur regrouped after her serve was broken and trailed Bacsinszky 3-1 in the first set.
Her power game came into play, as she rebounded to break back and bring the match back to 5-4.
Stosur then had a set point on Bacsinszky's serve, but she couldn't quite convert, as her backhand reply was wayward and her Swiss opponent took her opportunities and evened the match to 5-all.
The former US Open champion, won her next service game and followed up by breaking Bacsinszky's serve to take the first set 7-5.
Stosur lost her first service game of the second set, mirroring her slow start to the first set, but bounced back immediately, as Bacsinszky repeated the sins of Stosur in the first game and double faulted to hand the game to Stosur, 1-all.
Both players were having trouble hitting the mark during this set, with miscued shots at crucial times, but with Stosur's forehand going into the net at 30-40, she lost her next service game for Bacsinsky to go ahead 3-2.
The 2016 world ranked top 10 player then won her own service game to go ahead 4-2, before Stosur won her next service game for a 4-3 scoreline.
Both players won their next service games before Bacsinszky served out the penultimate set - 6-4.
Stosur came out rejuvenated after an extended break between sets, winning four straight points to take the first game of the third set with accurate power hitting, but three consecutive double faults on Stosur's next service game meant Bacsinzky led 2-1.
Stosur dug deep, however, and immediately broke back against Bacsinzsky with her accurate power game switching on once again and during her own serve, she managed to hold on for a 3-2 lead.
Bacszinszky held her serve and there were too many unforced errors from Stosur on her own serve as the two-time French Open semi-finalist took the lead in the 3rd set, 4-3.
From there Stosur, our only female grand slam winner since Evonne Cawley's Wimbledon victory in 1980, imploded as her power game once again abandoned her at the death.
Stosur will now turn her attention Australian Open while Bacsinszky moves into the quarter finals of this tournament.