1999 Japan Open Tennis Championships

The 1999 Japan Open Tennis Championships was a tennis tournament played on outdoor hard courts at the Ariake Coliseum in Tokyo, Japan that was part of the International Series Gold of the 1999 ATP Tour and of Tier III of the 1999 WTA Tour. The tournament was held from April 12 through April 18, 1999. Nicolas Kiefer and Amy Frazier won the singles titles.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇯🇵 Saori Obata
 * 🇯🇵 Shinobu Asagoe

The following players received wildcards into the doubles main draw:
 * 🇯🇵 Haruka Inoue / 🇯🇵 Maiko Inoue

The following players received entry from the singles qualifying draw:


 * 🇺🇸 Katie Schlukebir
 * 🇯🇵 Misumi Miyauchi
 * 🇰🇷 Cho Yoon-jeong
 * 🇬🇧 Hannah Collin

The following players received entry as lucky losers:
 * Wynne Prakusya

Men's singles
🇩🇪 Nicolas Kiefer defeated Wayne Ferreira, 7–6(7–5), 7–5.
 * It was Kiefer's 1st title of the year and the 3rd of his career.

Women's singles
🇺🇸 Amy Frazier defeated 🇯🇵 Ai Sugiyama, 6–2, 6–2.
 * It was Frazier's 1st title of the year and the 9th of her career.

Men's doubles
🇺🇸 Jeff Tarango / 🇨🇿 Daniel Vacek defeated Wayne Black / 🇺🇸 Brian MacPhie, 4–3, retired.

Women's doubles
🇺🇸 Corina Morariu / 🇺🇸 Kimberly Po defeated 🇦🇺 Catherine Barclay / 🇦🇺 Kerry-Anne Guse, 6–3, 6–2.