Outcome No. Date Championship Surface Opponent in the final Score in the final
Runner-up 1. 1975 Båstad, Sweden Clay Spain Manuel Orantes 0–6, 3–6
Runner-up 2. 1976 São Paulo, Brazil Carpet Argentina Guillermo Vilas 3–6, 0–6
Winner 1. 1976 Santiago, Chile Clay Brazil Carlos Kirmayr 5–7, 6–4, 6–4
Winner 2. 1977 Murcia, Spain Clay United Kingdom Buster Mottram 6–4, 6–0, 6–3
Runner-up 3. 1977 Bogotá, Colombia Clay Argentina Guillermo Vilas 1–6, 2–6, 3–6
Winner 3. 1978 Cairo, Egypt Clay Sweden Kjell Johansson 4–6, 6–4, 6–4
Winner 4. 1978 Nice, France Clay France Yannick Noah 6–3, 6–4, 6–4
Runner-up 4. 1978 Indianapolis, U.S. Clay United States Jimmy Connors 0–6, 3–6
Winner 5. 1978 Bournemouth, England Clay Italy Paolo Bertolucci 6–2, 6–1, 6–3
Winner 6. 1978 Madrid, Spain Clay Czechoslovakia Tomáš Šmíd 6–7, 6–3, 6–3, 6–4
Winner 7. 1979 Houston, U.S. Clay United States Gene Mayer 6–3, 2–6, 7–6
Winner 8. 1979 Hamburg, Germany Clay United States Harold Solomon 3–6, 6–1, 6–4, 6–1
Runner-up 5. 1979 North Conway, U.S. Clay United States Harold Solomon 7–5, 4–6, 6–7
Winner 9. 1979 Boston, U.S. Clay Chile Hans Gildemeister 6–3, 6–1
Runner-up 6. 1979 Quito, Ecuador Clay Paraguay Víctor Pecci 6–2, 4–6, 2–6
Runner-up 7. 1979 Santiago, Chile Clay Chile Hans Gildemeister 5–7, 7–5, 4–6
Runner-up 8. 1981 Viña del Mar, Chile Clay Paraguay Víctor Pecci 4–6, 0–6
Runner-up 9. 1982 Linz, Austria Clay Sweden Anders Järryd 4–6, 6–4, 4–6
Winner 10. 1982 Hamburg, Germany Clay Australia Peter McNamara 4–6, 6–7, 7–6, 6–3, 7–6
Runner-up 10. 1982 North Conway, U.S. Clay Czechoslovakia Ivan Lendl 3–6, 2–6
Winner 11. 1982 Indianapolis, U.S. Clay United States Jimmy Arias 7–5, 5–7, 6–3
Winner 12. 1983 La Quinta, U.S. Hard United States Eliot Teltscher 6–4, 6–2
Winner 13. 1983 Bournemouth, England Clay Czechoslovakia Tomáš Šmíd 2–6, 7–6, 7–5
Runner-up 11. 1983 Hamburg, Germany Clay France Yannick Noah 6–3, 5–7, 2–6, 0–6
Runner-up 12. 1983 Rome, Italy Clay United States Jimmy Arias 2–6, 7–6, 1–6, 4–6
Winner 14. 1983 Stuttgart Outdoor, Germany Clay Switzerland Heinz Günthardt 6–1, 6–1, 7–6
Winner 15. 1984 Kitzbühel, Austria Clay Paraguay Víctor Pecci 7–5, 3–6, 6–1
Winner 16. 1984 Bordeaux, France Clay Italy Francesco Cancellotti 7–5, 6–1