8th Tournament:Jan. 29 - Feb. 3, 1991
| Venue | Tokyo Metropolitan Gymnasium | |
|---|---|---|
| Prize Money | US$350,000 | |
| Winner | Singles | Gabriela Sabatini |
| Doubles | Kathy Jordan / Elizabeth Smylie | |

| Venue | Tokyo Metropolitan Gymnasium | |
|---|---|---|
| Prize Money | US$350,000 | |
| Winner | Singles | Gabriela Sabatini |
| Doubles | Kathy Jordan / Elizabeth Smylie | |
All four Grand Slam winners of previous year participated; S. Graff (Australian Open), M. Seles (Roland Garros), M. Navratilova (Wimbledon), and G. Sabatini (US Open).
Sabatini edged the all-time No.1 ranking Graf after full-set with tie-break at the quarter-final. Sabatini won the close game against Navratilova, through the full-set at the Final, which is the second PPO victory for her.

