The 1999 Sydney International was a tennis tournament played on outdoor hard courts at the White City Stadium in Sydney in Australia that was part of the International Series of the 1999 ATP Tour and of Tier II of the 1999 WTA Tour. The tournament was held from 11 through 16 January 1999.
| Country | Player | Rank | Seed | |
|---|---|---|---|---|
| Lindsay Davenport | 1 | 1 | ||
| Martina Hingis | 2 | 2 | ||
 Spain | Arantxa Sánchez Vicario | 4 | 3 | |
| Venus Williams | 5 | 4 | ||
| Spain | Conchita Martínez | 9 | 5 | |
| Steffi Graf | 10 | 6 | ||
| Patty Schnyder | 8 | 7 | ||
 Belgium | Dominique Van Roost | 12 | 8 |
The following players received wildcards into the women's singles main draw:
The following players received wildcards into the women's doubles main draw:
The following players received entry from the women's singles qualifying draw:
The following players received entry from the women's doubles qualifying draw:
See main article: 1999 Sydney International – Men's singles. 
Todd Martin defeated Àlex Corretja, 6–3, 7–6(7–5)
See main article: 1999 Sydney International – Women's singles. Lindsay Davenport defeated Martina Hingis, 6–4, 6–3
See main article: 1999 Sydney International – Men's doubles. 
Sébastien Lareau / Daniel Nestor defeated Patrick Galbraith / Paul Haarhuis, 6–3, 6–4
See main article: 1999 Sydney International – Women's doubles. 
Elena Likhovtseva / 
Ai Sugiyama defeated Mary Joe Fernández / Anke Huber, 6–3, 2–6, 6–0
