Table:
text: Manuela Maleeva
Singles: 37 (19–18)
Singles: 37 (19–18)
Outcome Date_ Tournament Surface Opponent_in_the_final Score_in_the_final
Winner 29 February 1988 Wichita , USA WTA Tier V Hard (I) Sylvia Hanika 7–6 (7–5) , 7–5
Winner 12 September 1988 Phoenix , USA WTA Tier V Hard Dinky Van Rensburg 6–3, 4–6, 6–2
Runner-up 17 October 1988 Zürich , Switzerland WTA Tier IV Carpet (I) Pam Shriver 3–6, 4–6
Runner-up 24 October 1988 Brighton , UK WTA Tier III Carpet (I) Steffi Graf 2–6, 0–6
Winner 12 March 1989 Indian Wells , USA WTA Tier III Hard Jenny Byrne 6–4, 6–1
Winner 22 May 1989 Geneva , Switzerland WTA Tier V Clay Conchita Martínez 6–4, 6–0
Runner-up 12 February 1990 Chicago , USA WTA Tier I Carpet (I) Martina Navratilova 3–6, 2–6

text: Manuela Maleeva
Singles: 37 (19–18)
Singles: 37 (19–18)
Outcome Date_ Tournament Surface Opponent_in_the_final Score_in_the_final
Winner 28 September 1992 Bayonne , France WTA Tier IV Carpet (I) Nathalie Tauziat 6–7 (4–7) , 6–2, 6–3
Winner 22 February 1993 Linz , Austria WTA Tier III Carpet (I) Conchita Martínez 6–2, 1–0, Ret.
Winner 4 October 1993 Zürich , Switzerland WTA Tier I Carpet (I) Martina Navratilova 6–3, 7–6 (7–1)
Winner 8 February 1994 Osaka , Japan WTA Tier III Carpet (I) Iva Majoli 6–1, 4–6, 7–5

text: Manuela Maleeva
Singles: 37 (19–18)
Singles: 37 (19–18)
Outcome Date_ Tournament Surface Opponent_in_the_final Score_in_the_final
Runner-up 7 January 1985 Washington , USA WTA Virginia Slims Carpet (I) Martina Navratilova 3–6, 2–6
Runner-up 20 May 1985 Lugano , Switzerland WTA Virginia Slims Clay Bonnie Gadusek 4–6, 2–6
Runner-up 21 October 1985 Brighton , UK WTA Virginia Slims Carpet (I) Chris Evert 5–7, 3–6
Runner-up 11 November 1985 Tokyo , Japan WTA Virginia Slims Carpet (I) Chris Evert 5–7, 0–6
Winner 9 December 1985 Tokyo , Japan WTA Virginia Slims Carpet (I) Bonnie Gadusek 7–6 (7–2) , 3–6, 7–5
Runner-up 19 May 1986 Lugano , Switzerland WTA Virginia Slims Clay Raffaella Reggi 7–5, 3–6, 6–7 (6–8)
Runner-up 9 June 1986 Birmingham , UK WTA Virginia Slims Grass Pam Shriver 2–6, 6–7 (0–7)

text: Manuela Maleeva
Singles: 37 (19–18)
Singles: 37 (19–18)
Outcome Date_ Tournament Surface Opponent_in_the_final Score_in_the_final
Runner-up 8 September 1986 Tokyo , Japan WTA Virginia Slims Carpet (I) Steffi Graf 4–6, 2–6
Winner 30 March 1987 Wild Dunes , USA WTA Virginia Slims Clay Raffaella Reggi 5–7, 6–2, 6–3
Runner-up 6 April 1987 Hilton Head Island , USA WTA Virginia Slims Clay Steffi Graf 2–6, 6–4, 3–6
Runner-up 18 May 1987 Geneva , Switzerland WTA Virginia Slims Clay Chris Evert 3–6, 6–4, 2–6
Winner 24 August 1987 Mahwah , USA WTA Virginia Slims Hard Sylvia Hanika 1–6, 6–4, 6–1
Runner-up 14 September 1987 Tokyo , Japan WTA Virginia Slims Carpet (I) Gabriela Sabatini 4–6, 6–7 (6–8)

text: Manuela Maleeva
Singles: 37 (19–18)
Singles: 37 (19–18)
Outcome Date_ Tournament Surface Opponent_in_the_final Score_in_the_final
Runner-up 30 January 1984 Houston , USA WTA Virginia Slims Carpet (I) Hana Mandlíková 4–6, 2–6
Winner 7 May 1984 Lugano , Switzerland WTA Virginia Slims Clay Iva Budařová 6–1, 6–1
Winner 21 May 1984 Perugia , Italy WTA Virginia Slims Clay Chris Evert 6–3, 6–3
Winner 6 August 1984 Indianapolis , USA WTA Virginia Slims Clay Lisa Bonder 6–4, 6–3
Winner 12 November 1984 Tokyo , Japan WTA Virginia Slims Carpet (I) Hana Mandlíková 6–1, 1–6, 6–4
Winner 10 December 1984 Tokyo , Japan WTA Virginia Slims Carpet (I) Claudia Kohde-Kilsch 3–6, 6–4, 6–4

text: Manuela Maleeva
Singles: 37 (19–18)
Singles: 37 (19–18)
Outcome Date_ Tournament Surface Opponent_in_the_final Score_in_the_final
Runner-up 27 March 1990 San Antonio , USA WTA Tier III Hard Monica Seles 4–6, 3–6
Runner-up 6 August 1990 San Diego , USA WTA Tier III Hard Steffi Graf 3–6, 2–6
Winner 11 February 1991 Linz , Austria WTA Tier V Carpet (I) Petra Langrová 6–4, 7–6 (7–1)
Runner-up 22 April 1991 Barcelona , Spain WTA Tier III Clay Conchita Martínez 4–6, 1–6
Winner 20 May 1991 Geneva , Switzerland WTA Tier IV Clay Helen Kelesi 6–3, 3–6, 6–3
Winner 23 September 1991 Bayonne , France WTA Tier IV Carpet (I) Leila Meskhi 4–6, 6–3, 6–4
Runner-up 6 July 1992 Kitzbühel , Austria WTA Tier IV Clay Conchita Martínez 0–6, 6–3, 2–6

Question: What was the surface on which the result on March 12, 1989 among the singles winners was: 37 (19-18) Manuela Maleeva?