1990 Nichirei International Championships

The 1990 Nichirei International Championships was a women's tennis tournament played on outdoor hard courts at the Ariake Coliseum in Tokyo, Japan that was part of Tier II of the 1990 WTA Tour. It was the inaugural edition of the tournament and was held from 25 through 30 September 1990. Fourth-seeded Mary Joe Fernández won the singles title and earned $70,000 first-prize money.

Singles
🇺🇸 Mary Joe Fernández defeated 🇺🇸 Amy Frazier 3–6, 6–2, 6–3
 * It was Fernández' first singles title of her career.

Doubles
🇺🇸 Mary Joe Fernández / 🇺🇸 Robin White defeated 🇺🇸 Gigi Fernández / 🇺🇸 Martina Navratilova 4–6, 6–3, 7–6(7–4)