Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Outcome | Date | Tournament | Surface | Opponent in the final | Score in the final |
| --- | --- | --- | --- | --- | --- |
| Winner | 1 April 1985 | Seabrook Island , USA WTA Virginia Slims | Clay | Virginia Ruzici | 6–3, 6–3 |
| Runner-up | 22 April 1985 | Orlando , USA WTA Virginia Slims | Clay | Martina Navratilova | 1–6, 0–6 |
| Winner | 4 November 1985 | Hilversum , Netherlands WTA Virginia Slims | Carpet (I) | Carina Karlsson | 6–3, 6–2 |
| Winner | 13 April 1987 | Tokyo , Japan WTA Virginia Slims | Hard | Barbara Gerken | 6–2, 6–3 |
| Winner | 5 October 1987 | Athens , Greece WTA Virginia Slims | Clay | Julie Halard | 6–0, 6–1 |
| Runner-up | 29 February 1988 | San Antonio , USA WTA Tier IV | Hard | Steffi Graf | 4–6, 1–6 |
| Runner-up | 25 July 1988 | Hamburg , West Germany WTA Tier IV | Clay | Steffi Graf | 4–6, 2–6 |
| Winner | 24 October 1988 | Indianapolis , USA WTA Tier V | Hard (I) | Zina Garrison | 6–3, 2–6, 6–2 |
| Winner | 24 July 1989 | Båstad , Sweden WTA Tier V | Clay | Sabine Hack | 6–1, 6–3 |
| Runner-up | 31 July 1989 | Sofia , Bulgaria WTA Tier V | Clay | Isabel Cueto | 2–6, 6–7 (3–7) |
| Winner | 16 October 1989 | Bayonne , France WTA Tier V | Hard (I) | Conchita Martínez | 6–2, 6–2 |
| Winner | 30 October 1989 | Indianapolis , USA WTA Tier V | Hard (I) | Raffaella Reggi | 6–4, 6–4 |
| Winner | 26 March 1990 | Houston , USA WTA Tier III | Clay | Arantxa Sánchez Vicario | 6–1, 1–6, 6–4 |
| Runner-up | 16 April 1990 | Tampa , USA WTA Tier III | Clay | Monica Seles | 1–6, 0–6 |
| Runner-up | 30 July 1990 | Montreal , Canada WTA Tier I | Hard | Steffi Graf | 1–6, 7–6 (10–8) , 3–6 |
| Runner-up | 5 August 1991 | Toronto , Canada WTA Tier I | Hard | Jennifer Capriati | 2–6, 3–6 |
| Runner-up | 19 August 1991 | Washington , USA WTA Tier II | Hard | Arantxa Sánchez Vicario | 2–6, 5–7 |
| Winner | 11 November 1991 | Indianapolis , USA WTA Tier IV | Hard (I) | Audra Keller | 7–6 (7–1) , 6–2 |
| Runner-up | 1 November 1993 | Quebec , Canada WTA Tier III | Hard (I) | Nathalie Tauziat | 4–6, 1–6 |
| Winner | 31 October 1994 | Quebec , Canada WTA Tier III | Carpet (I) | Brenda Schultz | 6–3, 6–3 |
Question:
On what date is Isabel cueto the opponent in the final?
Answer:
31 July 1989