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 | Partner | Opponents in the final | Score in the final |
| --- | --- | --- | --- | --- | --- | --- |
| Runners-up | April 29, 1985 | Houston , USA WTA Virginia Slims | Clay | Helena Suková | Elise Burgin Martina Navratilova | 1–6, 6–3, 3–6 |
| Winners | July 22, 1985 | Indianapolis , USA WTA Virginia Slims | Clay | Katerina Maleeva | Penny Barg Paula Smith | 3–6, 6–3, 6–4 |
| Runners-up | September 8, 1986 | Tokyo , Japan WTA Virginia Slims | Carpet (I) | Katerina Maleeva | Bettina Bunge Steffi Graf | 1–6, 7–6 (9–7) , 2–6 |
| Winners | July 6, 1987 | Knokke , Belgium WTA Virginia Slims | Clay | Bettina Bunge | Kathleen Horvath Marcella Mesker | 4–6, 6–4, 6–4 |
| Runners-up | September 14, 1987 | Tokyo , Japan WTA Virginia Slims | Carpet (I) | Katerina Maleeva | Anne White Robin White | 1–6, 2–6 |
| Winners | February 11, 1991 | Linz , Austria WTA Tier V | Carpet (I) | Raffaella Reggi | Petra Langrová Radka Zrubáková | 6–4, 1–6, 6–3 |
| Runners-up | May 20, 1991 | Geneva , Switzerland WTA Tier IV | Clay | Cathy Caverzasio | Nicole Bradtke Elizabeth Smylie | 1–6, 2–6 |
| Runners-up | February 9, 1993 | Osaka , Japan WTA Tier III | Carpet (I) | Magdalena Maleeva | Jana Novotná Larisa Neiland | 1–6, 3–6 |
| Winners | April 5, 1993 | Amelia Island , USA WTA Tier II | Clay | Leila Meskhi | Amanda Coetzer Inés Gorrochategui | 3–6, 6–3, 6–4 |
| Runners-up | April 19, 1993 | Barcelona , Spain WTA Tier II | Clay | Magdalena Maleeva | Conchita Martínez Arantxa Sánchez Vicario | 6–4, 1–6, 0–6 |
| Runners-up | July 26, 1993 | Stratton Mountain , USA WTA Tier II | Hard | Mercedes Paz | Elizabeth Smylie Helena Suková | 1–6, 2–6 |
Question:
On what surface was the tournament with opponents kathleen horvath marcella mesker in the finals?
Answer:
Clay