| 1999 Japan Open Tennis Championships | |
|---|---|
| Date | 12–18 April |
| Edition | 26th |
| Category | Championship Series Tier III |
| Surface | Hard / outdoor |
| Location | Tokyo, Japan |
| Venue | Ariake Coliseum |
| Champions | |
| Men's singles | |
 Nicolas Kiefer[1][2] | |
| Women's singles | |
 Amy Frazier[3] | |
| Men's doubles | |
Jeff Tarango / Daniel Vacek[1][4] | |
| Women's doubles | |
| Corina Morariu /Kimberly Po[3] | |
The1999 Japan Open Tennis Championships was atennis tournament played onoutdoor hard courts at theAriake Coliseum inTokyo, Japan that was part of theInternational Series Gold of the1999 ATP Tour and ofTier III of the1999 WTA Tour. The tournament was held from April 12 through April 18, 1999. Fifth-seededNicolas Kiefer and second-seededAmy Frazier won the singles titles.
Nicolas Kiefer defeated
Wayne Ferreira, 7–6(7–5), 7–5
Amy Frazier defeated
Ai Sugiyama, 6–2, 6–2
Jeff Tarango /Daniel Vacek defeated
Wayne Black /Brian MacPhie, 4–3, retired
Corina Morariu /Kimberly Po defeated
Catherine Barclay /Kerry-Anne Guse, 6–3, 6–2
| Country | Player | Rank | Seed |
|---|---|---|---|
| JPN | Ai Sugiyama | 27 | 1 |
| USA | Amy Frazier | 35 | 2 |
| USA | Corina Morariu | 36 | 3 |
| USA | Kimberly Po | 58 | 4 |
 PUR | Kristina Brandi | 65 | 5 |
| USA | Meghann Shaughnessy | 68 | 6 |
| USA | Jane Chi | 75 | 7 |
 TPE | Wang Shi-ting | 77 | 8 |
The following players received wildcards into the singles main draw:
The following players received wildcards into the doubles main draw:
The following players received entry from the singles qualifying draw:
The following players received entry as lucky losers:
