Thomas Muster Singles: 55 (44–11) Singles: 55 (44–11)

| Outcome | Date_ | Championship | Surface | Opponent | Score |
|---|---|---|---|---|---|
| Winner | 4 August 1986 | Hilversum | Clay | Jakob Hlasek | 6–1, 6–3, 6–3 |
| Winner | 11 July 1988 | Boston | Clay | Lawson Duncan | 6–2, 6–2 |
| Winner | 1 August 1988 | Bordeaux | Clay | Ronald Agénor | 6–3, 6–3 |
| Winner | 15 August 1988 | Prague | Clay | Guillermo Pérez-Roldán | 6–4, 5–7, 6–2 |
| Runner-up | 19 September 1988 | Barcelona | Clay | Kent Carlsson | 3–6, 3–6, 6–3, 1–6 |
| Winner | 26 September 1988 | Bari | Clay | Marcelo Filippini | 2–6, 6–1, 7–5 |
| Runner-up | 24 October 1988 | Vienna | Carpet | Horst Skoff | 6–4, 3–6, 4–6, 2–6 |
| Runner-up | 3 April 1989 | Miami | Hard | Ivan Lendl | W/O |
| Winner | 8 January 1990 | Adelaide | Hard | Jimmy Arias | 3–6, 6–2, 7–5 |