The 1999 Australian Open – Women's Singles was the women's singles event of the eighty-seventh edition of the Australian Open, the first Grand Slam of the year and the most prestigious tournament in the Asia-Pacific and the Southern Hemisphere. Martina Hingis was the two-time defending champion, and she successfully defended her title by defeating unseeded Amélie Mauresmo, 6–2, 6–3, in the final.
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