1980 Toray Sillook Open
The 1980 Toray Sillook Open was a women's singles tennis tournament played on indoor carpet courts at Yoyogi National Gymnasium in Tokyo in Japan. The event was part of the AAAA category of the 1980 Colgate Series. It was the eighth edition of the tournament and was held from 8 September through 14 September 1980. First-seeded Billie Jean King won the title and earned $34,000 first-prize money.Finals
Singles
defeated Terry Holladay 7–5, 6–4
| Event | W | F | 3rd | 4th | QF | Round of 16 | Round of 32 |
| Singles | $34,000 | $18,000 | $10,500 | $8,500 | $4,600 | $2,500 | $1,300 |
