Belus Prajoux
Belus Prajoux Nadjar is a retired professional tennis player from Chile.
Prajoux won six doubles titles on the ATP Tour during his career. He reached a highest doubles ranking of No. 17 in July 1982. He was a member of the Chile Davis Cup team, and played on the team that reached the final of the 1976 Davis Cup. Prajoux retired from the tour in 1986.
Grand Slam finals
Doubles (1 loss)
| Result | Year | Championship | Surface | Partner | Opponents | Score |
| Loss | 1982 | French Open | Clay |  Hans Gildemeister |  Sherwood Stewart Ferdi Taygan | 5–7, 3–6, 1–1 ret. |
ATP career finals
Doubles (6 wins, 12 losses)
| Result | No. | Date | Tournament | Surface | Partner | Opponents | Score |
| Win | 1. | Jul 1976 | Hilversum, Netherlands | Clay |  Ricardo Cano |  Wojciech Fibak  Balázs Taróczy | 6–4, 6–3 |
| Loss | 1. | Nov 1976 | São Paulo,, Brazil | Carpet | Ricardo Cano | Lito Álvarez  Víctor Pecci | 4–6, 6–3, 3–6 |
| Loss | 2. | Nov 1976 | Buenos Aires, Argentina | Carpet | Ricardo Cano |  Carlos Kirmayr Lito Álvarez | 4–6, 5–7 |
| Loss | 3. | Dec 1976 | Santiago, Chile | Clay | Lito Álvarez | Patricio Cornejo Hans Gildemeister | 3–6, 6–7 |
| Win | 2. | Nov 1977 | Bogotá, Colombia | Clay | Hans Gildemeister |  Jorge Andrew  Carlos Kirmayr | 6–4, 6–2 |
| Win | 3. | May 1978 | Rome, Italy | Clay | Víctor Pecci |  Jan Kodeš Tomáš Šmíd | 6–7, 7–6, 6–1 |
| Loss | 4. | Jun 1978 | Birmingham, UK | Grass | José Luis Clerc | Dick Stockton Erik Van Dillen | 6–4, 1–6, 6–3, 6–8, 3–6 |
| Loss | 5. | Jul 1978 | Stuttgart, West Germany | Clay | Carlos Kirmayr | Jan Kodeš Tomáš Šmíd | 3–6, 6–7 |
| Loss | 6. | Nov 1978 | Buenos Aires, Argentina | Clay | José Luis Clerc |  Chris Lewis Van Winitsky | 4–6, 6–3, 0–6 |
| Loss | 7. | Nov 1980 | Quito, Ecuador | Clay | José Luis Clerc |  Andrés Gómez Hans Gildemeister | 3–6, 6–1, 4–6 |
| Win | 4. | Nov 1980 | Santiago, Chile | Clay |  Ricardo Ycaza | Carlos Kirmayr João Soares | 4–6, 7–6, 6–4 |
| Win | 5. | Sep 1981 | Bordeaux, France | Clay | Andrés Gómez | Jim Gurfein  Anders Järryd | 7–5, 6–3 |
| Loss | 8. | Sep 1981 | Palermo, Italy | Clay | Jaime Fillol |  José Luis Damiani Diego Pérez | 1–6, 4–6 |
| Loss | 9. | Nov 1981 | Santiago, Chile | Clay | Ricardo Cano | Hans Gildemeister Andrés Gómez | 2–6, 6–7 |
| Loss | 10. | May 1982 | French Open, France | Clay | Hans Gildemeister | Sherwood Stewart Ferdi Taygan | 5–7, 3–6. 1–1 ret. |
| Win | 6. | Feb 1983 | Viña del Mar, Chile | Clay | Hans Gildemeister | Júlio Góes Ney Keller | 6–3, 6–1 |
| Loss | 11. | Mar 1983 | Nancy, France | Clay | Ricardo Acuña | Jan Gunnarsson Anders Järryd | 5–7, 3–6 |
| Loss | 12. | Jul 1983 | Boston, United States | Clay | Hans Gildemeister | Mark Dickson Cássio Motta | 5–7, 3–6 |