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Mark Koevermans (; born 3 February 1968) is a former tennis player from the Netherlands, who turned professional in 1987. He represented his native country as a lucky loser at the 1992 Summer Olympics in Barcelona, where he was defeated in the third round by Brazil's Jaime Oncins. Going by the nickname Koef, a right-hander, won one career title in singles (Athens, 1990). He reached his highest singles ATP-ranking on 27 May 1991, when he was ranked number 37.
In April 2009, Koevermans was appointed as commercial director at Dutch football club Feyenoord.
| Grand Slam tournaments (0) |
| Tennis Masters Cup (0) |
| ATP Masters Series (1) |
| ATP International Series Gold (0) |
| ATP International Series (3) |
| Loss | 1. | 1990 | Casablanca, Morocco | Clay | Paul Haarhuis | Todd Woodbridge Simon Youl | 3–6, 1–6 |
| Loss | 2. | 1990 | Hilversum, Netherlands | Clay | Paul Haarhuis | Sergio Casal Emilio Sánchez | 5–7, 5–7 |
| Loss | 3. | 1990 | São Paulo, Brazil | Carpet | Luiz Mattar | Shelby Cannon Alfonso Mora | 7–6, 3–6, 6–7 |
| Loss | 4. | 1991 | ATP Adelaide | Hard | Paul Haarhuis | Wayne Ferreira Stefan Kruger | 4–6, 6–4, 4–6 |
| Win | 1. | 1991 | ATP Estoril | Clay | Paul Haarhuis | Tom Nijssen Cyril Suk | 6–3, 6–3 |
| Loss | 5. | 1991 | Monte Carlo, Monaco | Clay | Paul Haarhuis | Luke Jensen Laurie Warder | 7–5, 6–7, 4–6 |
| Win | 2. | 1991 | Athens, Greece | Clay | Jacco Eltingh | Menno Oosting Olli Rahnasto | 5–7, 7–6, 7–5 |
| Loss | 6. | 1992 | ATP Rotterdam | Carpet | Paul Haarhuis | Marc-Kevin Goellner David Prinosil | 2–6, 7–6, 6–7 |
| Loss | 7. | 1992 | Genova, Italy | Clay | Paul Haarhuis | Shelby Cannon Greg Van Emburgh | 1–6, 1–6 |
| Win | 3. | 1992 | Hilversum, Netherlands | Clay | Paul Haarhuis | Marten Renström Mikael Tillström | 6–7, 6–1, 6–4 |
| Loss | 8. | 1992 | Athens, Greece | Clay | Marcelo Filippini | Tomás Carbonell Francisco Roig | 3–6, 4–6 |
| Loss | 9. | 1992 | Tel Aviv, Israel | Hard | Tobias Svantesson | Mike Bauer João Cunha e Silva | 3–6, 4–6 |
| Loss | 10. | 1993 | Monte Carlo, Monaco | Clay | Paul Haarhuis | Stefan Edberg Petr Korda | 6–3, 2–6, 6–7 |
| Win | 4. | 1993 | Hamburg Masters | Clay | Paul Haarhuis | Grant Connell Patrick Galbraith | 6–4, 6–7, 7–6 |
| Loss | 11. | 1993 | ATP Florence | Clay | Greg Van Emburgh | Tomás Carbonell Libor Pimek | 6–7, 6–2, 1–6 |
| Loss | 12. | 1993 | Genova, Italy | Clay | Greg Van Emburgh | Sergio Casal Emilio Sánchez | 3–6, 6–7 |
| Win | 1–0 | Oct 1990 | Athens, Greece | Clay | Franco Davín | 5–7, 6–4, 6–1 |
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