Martin Sinner (born 7 February 1968) is a professional tennis player from Germany. He achieved a career-high singles ranking of world No. 42 in 1995.
Sinner played professional tennis for 15 years and earned $896,974. Currently he is a coach in tennis club SV Böblingen (Germany).
| {class=wikitable style=font-size:90% !Legend |
| Grand Slam tournaments (0–0) |
| ATP Masters 1000 Series (0–0) |
| ATP 500 Series (0–0) |
| ATP 250 Series (2–0) |
| Hard (1–0) |
| Clay (0–0) |
| Grass (0–0) |
| Carpet (1–0) |
| Outdoors (1–0) |
| Indoors (1–0) |
| Win | 1–0 | Copenhagen Open, Denmark | World Series | Carpet (i) | Andrei Olhovskiy | 6–7(3–7), 7–6(10–8), 6–3 | |
| Win | 2–0 | Johannesburg, South Africa | World Series | Hard | Guillaume Raoux | 6–1, 6–4 |
| {class=wikitable style=font-size:90% !Legend |
| Grand Slam tournaments (0–0) |
| ATP Masters 1000 Series (0–0) |
| ATP 500 Series (0–0) |
| ATP 250 Series (0–1) |
| Hard (0–1) |
| Clay (0–0) |
| Grass (0–0) |
| Carpet (0–0) |
| Outdoors (0–1) |
| Indoors (0–0) |
| Loss | 0–1 | Johannesburg Open, South Africa | World Series | Hard | Joost Winnink | Rodolphe Gilbert Guillaume Raoux | 4–6, 6–3, 3–6 |
| {class=wikitable style=font-size:90% !Legend |
| ATP Challenger (5–5) |
| ITF Futures (0–0) |
| Hard (1–1) |
| Clay (3–2) |
| Grass (0–0) |
| Carpet (1–2) |
| Win | 1–0 | Pretoria, South Africa | Challenger | Hard | Wayne Ferreira | 6–4, 6–4 | |
| Win | 2–0 | Hanko, Finland | Challenger | Clay | Andrei Olhovskiy | 6–3, 6–3 | |
| Loss | 2–1 | Salzburg, Austria | Challenger | Clay | Markus Rackl | 6–1, 3–6, 4–6 | |
| Loss | 2–2 | Oberstaufen Cup, Germany | Challenger | Clay | Massimo Valeri | 3–6, 3–6 | |
| Loss | 2–3 | Sliema, Malta | Challenger | Hard | Hendrik-Jan Davids | 4–6, 6–7 | |
| Win | 3–3 | Sofia, Bulgaria | Challenger | Clay | Alejandro Aramburú Acuna | 6–2, 7–5 | |
| Win | 4–3 | Montauban, France | Challenger | Clay | Pier Gauthier | 7–6, 6–2 | |
| Loss | 4–4 | Wolfsburg, Germany | Challenger | Carpet (i) | David Prinosil | 4–6, 6–7 | |
| Loss | 4–5 | Hamburg, Germany | Challenger | Carpet (i) | David Prinosil | 1–6, 4–6 | |
| Win | 5–5 | Heilbronn, Germany | Challenger | Carpet (i) | Gianluca Pozzi | 6–0, 3–6, 6–3 |
| {class=wikitable style=font-size:90% !Legend |
| ATP Challenger (8–5) |
| ITF Futures (0–0) |
| Hard (1–0) |
| Clay (2–3) |
| Grass (0–0) |
| Carpet (5–2) |
| Win | 1–0 | Furth, Germany | Challenger | Carpet (i) | Michael Stich | Wojciech Kowalski Adrian Marcu | 4–6, 6–3, 7–6 | |
| Win | 2–0 | Heilbronn, Germany | Challenger | Carpet (i) | Michael Stich | Gheorghe Cosac Adrian Marcu | 4–6, 6–4, 7–6 | |
| Win | 3–0 | Salzburg, Austria | Challenger | Clay | Michael Stich | Brett Custer Simon Youl | walkover | |
| Loss | 3–1 | Telford, United Kingdom | Challenger | Carpet (i) | Russell Barlow | Nick Brown Nicholas Fulwood | 4–6, 5–7 | |
| Loss | 3–2 | Turin, Italy | Challenger | Clay | Christer Allgardh | Neil Borwick Nicholas Fulwood | 2–6, 6–3, 2–6 | |
| Loss | 3–3 | Salzburg, Austria | Challenger | Clay | Bruce Derlin | Johan Carlsson David Engel | 6–7, 2–6 | |
| Win | 4–3 | Bombay, India | Challenger | Hard | Martin Zumpft | Sascha Nensel Torben Theine | 6–1, 6–4 | |
| Win | 5–3 | Montauban, France | Challenger | Clay | Joost Winnink | Nicola Bruno Otavio Della | 7–5, 6–3 | |
| Loss | 5–4 | Heilbronn, Germany | Challenger | Carpet (i) | Joost Winnink | Saša Hiršzon Goran Ivanišević | 4–6, 4–6 | |
| Win | 6–4 | Wolfsburg, Germany | Challenger | Carpet (i) | Joost Winnink | Dirk Dier Lars Koslowski | 7–5, 6–3 | |
| Win | 7–4 | Hamburg, Germany | Challenger | Carpet (i) | David Prinosil | Clinton Ferreira Aleksandar Kitinov | 6–2, 6–3 | |
| Loss | 7–5 | Furth, Germany | Challenger | Clay | Joost Winnink | Brandon Coupe Paul Rosner | 5–7, 3–6 | |
| Win | 8–5 | Wolfsburg, Germany | Challenger | Carpet (i) | Jan-Ralph Brandt | Tomáš Cibulec Leoš Friedl | 7–5, 3–6, 7–6(9–7) |
| Grand Slam tournaments | ||||||||||||||||||||||
| Australian Open | Q3 | A | 1R | A | A | A | A | 2R | Q3 | A | A | A !0 / 2 !1–2 ! | ||||||||||
| French Open | A | A | A | A | A | A | 1R | A | A | 1R | A | A !0 / 2 !0–2 ! | ||||||||||
| Wimbledon | A | A | A | A | A | Q1 | 1R | A | 1R | 1R | A | A !0 / 3 !0–3 ! | ||||||||||
| US Open | A | A | A | A | A | A | 1R | Q3 | A | A | A | A !0 / 1 !0–1 ! | ||||||||||
| ATP Masters Series | ||||||||||||||||||||||
| Indian Wells | A | A | A | A | A | Q3 | A | A | A | A | A | A !0 / 0 !0–0 ! | ||||||||||
| Miami Masters | A | A | A | A | A | Q2 | A | A | A | A | A | A !0 / 0 !0–0 ! | ||||||||||
| Monte Carlo | A | A | A | A | A | Q1 | A | A | A | Q1 | A | A !0 / 0 !0–0 ! | ||||||||||
| Hamburg | A | A | A | A | A | A | 1R | A | Q2 | 1R | A | Q1 !0 / 2 !0–2 ! | ||||||||||
| Rome | A | A | A | A | A | A | 1R | A | Q2 | Q1 | A | A !0 / 1 !0–1 ! | ||||||||||
| Paris Masters | A | A | A | A | A | A | 1R | A | Q1 | A | A | A !0 / 1 !0–1 ! | ||||||||||
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