Wozniacki bags title
The third-seeded Dane trailed 1-3 in the third set but broke Stosur in the 12th game to clinch her second title of the season.
Italian second seed Andreas Seppi came from behind to beat Brazilian Thomaz Bellucci 3-6, 7-6 (7-3), 6-3 in the men's final.
Del Potro wins
Juan Martin del Potro stayed in hunt to claim one of the three remaining places for the season-ending ATP World Tour Finals after winning the Vienna Open title with a 7-5, 6-3 win over Slovenian qualifier Grega Zemlja.
Venus Williams ended her title drought, beating Romania's Monica Niculescu 6-2, 6-3 to win the Luxembourg Open title on Sunday.