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Kamil Adrian Majchrzak ([ˈkamil ˈmai̯xʂak]; born 13 January 1996, Piotrków Trybunalski) is a Polish professional tennis player. He has a career-high ATP singles ranking of world No. 61, achieved on 15 September 2025 and a doubles ranking of No. 241, achieved on 8 August 2016. He is currently the No. 1 male singles player from Poland.
| W | F | SF | QF | | RR | Q# | DNQ | A | NH |
| Tournament | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | SR | W–L | Win % |
| Grand Slam tournaments | ||||||||||||||
| Australian Open | A | A | A | Q1 | 1R | A | 1R | 2R | A | A | 1R | 0 / 4 | 1–4 | 20% |
| French Open | A | A | A | Q1 | Q1 | 1R | 2R | 1R | A | A | 1R | 0 / 4 | 1–4 | 20% |
| Wimbledon | A | A | A | Q2 | 1R | NH | Q3 | 1R | A | A | 4R | 0 / 3 | 3–3 | 50% |
| US Open | A | A | A | Q2 | 3R | 1R | 1R | 1R | A | Q3 | 3R | 0 / 5 | 4–5 | 44% |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 2–3 | 0–2 | 1–3 | 1–4 | 0–0 | 0–0 | 5–4 | 0 / 16 | 9–16 | 36% |
| ATP 1000 tournaments | ||||||||||||||
| Indian Wells Open | A | A | A | A | Q1 | NH | A | 2R | A | A | 1R | 0 / 1 | 1–1 | 50% |
| Miami Open | A | A | A | A | Q1 | NH | A | 2R | A | A | Q1 | 0 / 1 | 1–1 | 50% |
| Monte-Carlo Masters | A | A | A | A | A | NH | Q2 | Q2 | A | A | A | 0 / 0 | 0–0 | – |
| Madrid Open | A | A | A | A | A | NH | A | A | A | A | 2R | 0 / 1 | 0–1 | 0% |
| Italian Open | A | A | A | A | A | A | 1R | Q2 | A | A | Q1 | 0 / 1 | 0–1 | 0% |
| Canadian Open | A | A | A | A | A | NH | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Cincinnati Open | A | A | A | A | A | Q2 | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Shanghai Masters | A | A | A | A | A | NH | A | A | 3R | 0 / 1 | 2–1 | 67% | ||
| Paris Masters | A | A | A | A | A | A | A | A | A | A | Q1 | 0 / 0 | 0–0 | – |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–0 | 0–1 | 2–2 | 0–0 | 0–0 | 2-2 | 0 / 4 | 4–5 | 44% |
| Career statistics | ||||||||||||||
| Tournaments | 0 | 0 | 1 | 0 | 6 | 3 | 7 | 15 | 0 | 0 | 4 | Career total: 36 | ||
| Overall win–loss | 0–1 | 1–1 | 0–4 | 4–2 | 3–6 | 0–4 | 5–8 | 17–15 | 0–0 | 5 | 6–5 | 0 / 36 | 35–46 | 43% |
| Year-end ranking | 275 | 279 | 197 | 177 | 101 | 107 | 116 | 78 | - | 120 | $2,400,907 | |||
| Legend |
| ATP Challenger Tour (9–6) |
| Finals by surface |
| Hard (4–2) |
| Clay (5–3) |
| Grass (0–1) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Loss | 0–1 | Oct 2015 | Morocco Tennis Tour, Morocco | Challenger | Clay | Roberto Carballés Baena | 6–7(4–7), 2–6 |
| Loss | 0–2 | Oct 2017 | Tashkent Challenger, Uzbekistan | Challenger | Hard | Guillermo García López | 1–6, 6–7(1–7) |
| Loss | 0–3 | Oct 2018 | Tashkent Challenger, Uzbekistan | Challenger | Hard | Félix Auger-Aliassime | 3–6, 2–6 |
| Win | 1–3 | Mar 2019 | Open Harmonie, France | Challenger | Hard (i) | Maxime Janvier | 6–3, 7–6(7–1) |
| Win | 2–3 | May 2019 | Prosperita Open, Czech Republic | Challenger | Clay | Jannik Sinner | 6–1, 6–0 |
| Win | 3–3 | Sep 2020 | Moneta Czech Open, Czech Republic | Challenger | Clay | Pablo Andújar | 6–2, 7–6(7–5) |
| Loss | 3–4 | Jun 2021 | Nottingham Trophy, United Kingdom | Challenger | Grass | Alex Bolt | 6–4, 4–6, 3–6 |
| Loss | 3–5 | Sep 2021 | Szczecin Open, Poland | Challenger | Clay | Zdeněk Kolář | 6–7(4–7), 5–7 |
| Win | 4–5 | Oct 2022 | Busan Open, South Korea | Challenger | Hard | Radu Albot | 6–4, 3–6, 6–2 |
| Win | 5–5 | Feb 2024 | Rwanda Challenger, Rwanda | Challenger | Clay | Marco Trungelliti | 6–4, 6–4 |
| Loss | 5–6 | May 2024 | Macedonian Open, North Macedonia | Challenger | Clay | Joel Schwärzler | 3–6, 3–6 |
| Win | 6–6 | Jun 2024 | Bratislava Open, Slovakia | Challenger | Clay | Henrique Rocha | 6–0, 2–6, 6–3 |
| Win | 7–6 | Sep 2024 | JC Ferrero Challenger, Spain | Challenger | Hard | Nicolas Moreno de Alboran | 6–4, 6–2 |
| Win | 8–6 | April 2025 | Open de Madrid, Spain | Challenger | Clay | Marin Čilić | 6–3, 4–6, 6–4 |
| Win | 9–6 | Aug 2025 | Kozerki Open, Poland | Challenger | Hard | Dino Prižmić | 6–4, 6–3 |
| Legend |
| ATP Challenger Tour (1–3) |
| Finals by surface |
| Hard (1–0) |
| Clay (0–3) |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Sep 2015 | Copa Sevilla, Spain | Challenger | Clay | Marco Bortolotti | Wesley Koolhof Matwé Middelkoop | 6–7(5–7), 4–6 |
| Loss | 0–2 | Sep 2015 | Arimex Trophy, Slovakia | Challenger | Clay | Stéphane Robert | Wesley Koolhof Matwé Middelkoop | 4–6, 2–6 |
| Loss | 0–3 | Sep 2016 | Poznań Open, Poland | Challenger | Clay | Mateusz Kowalczyk | Aleksandre Metreveli Peng Hsien-yin | 4–6, 6–3, [8–10] |
| Win | 1–3 | Oct 2020 | Tennis Challenger Hamburg, Germany | Challenger | Hard (i) | Marc-Andrea Hüsler | Lloyd Glasspool Alex Lawson | 6–3, 1–6, [20–18] |
| Legend |
| ITF Futures/WTT (11–5) |
| Finals by surface |
| Hard (4–0) |
| Clay (7–5) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Mar 2014 | F4 Cartagena, Spain | Futures | Clay | Roberto Carballés Baena | 1–6, 7–6(7–4), 6–3 |
| Win | 2–0 | Jul 2014 | F2 Michalovce, Slovakia | Futures | Clay | Filip Brtnický | 6–2, 6–3 |
| Loss | 2–1 | Sep 2014 | F7 Piekary Śląskie, Poland | Futures | Clay | Dušan Lojda | 6–4, 3–6, 6–7(3–7) |
| Loss | 2–2 | Jan 2015 | F2 Cairo, Egypt | Futures | Clay | Mohamed Safwat | 5–7, 3–6 |
| Loss | 2–3 | Feb 2015 | F3 Cairo, Egypt | Futures | Clay | Laslo Đere | 3–6, 5–7 |
| Win | 3–3 | Apr 2015 | F9 Reus, Spain | Futures | Clay | Marc Giner | 6–3, 6–2 |
| Win | 4–3 | May 2015 | F4 Bacău, Romania | Futures | Clay | Dragoș Dima | 6–1, 6–2 |
| Loss | 4–4 | May 2016 | F2 Szeged, Hungary | Futures | Clay | Germain Gigounon | 4–6, 3–6 |
| Win | 5–4 | May 2016 | F2 Cherkassy, Ukraine | Futures | Clay | Vladyslav Manafov | 6–2, 6–4 |
| Win | 6–4 | Jun 2016 | F3 Sopot, Poland | Futures | Clay | Andriej Kapaś | 7–5, 6–4 |
| Win | 7–4 | Jan 2017 | F1 Antalya, Turkey | Futures | Hard | Liam Broady | 5–7, 6–3, 6–3 |
| Loss | 7–5 | Jun 2017 | F1 Sopot, Poland | Futures | Clay | Zdeněk Kolář | 3–6, 2–6 |
| Win | 8–5 | Oct 2017 | F24 Rodez, France | Futures | Hard (i) | Antoine Hoang | 7–6(7–3), 2–6, 6–1 |
| Win | 9–5 | Jan 2024 | M15 Monastir, Tunisia | WTT | Hard (i) | Ryuki Matsuda | 6–1, 6–1 |
| Win | 10–5 | Feb 2024 | M25 Hammamet, Tunisia | WTT | Clay | Jay Clarke | 6–3, 7–5 |
| Win | 11–5 | Apr 2024 | M25 Sharm El Sheikh, Egypt | WTT | Hard | Karim-Mohamed Maamoun | 6–3, 6–2 |
| Legend |
| ITF Futures/WTT (5–2) |
| Finals by surface |
| Hard (0–0) |
| Clay (5–2) |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Loss | 0–1 | Aug 2013 | F4 Poznań, Poland | Futures | Clay | Phillip Gresk | Romain Arneodo Benjamin Balleret | 2–6, 4–6 |
| Win | 1–1 | Jan 2015 | F2 Cairo, Egypt | Futures | Clay | Maxime Janvier | Na Jung-woong Yun Jae-won | 6–2, 6–2 |
| Win | 2–1 | Feb 2016 | F2 Peguera, Spain | Futures | Clay | Tomislav Brkić | Carlos Taberner Kento Yamada | 6–3, 6–4 |
| Loss | 2–2 | May 2016 | F2 Cherkassy, Ukraine | Futures | Clay | Federico Maccari | Vladimir Ivanov Lukas Mugevičius | 3–6, 3–6 |
| Win | 3–2 | Jun 2016 | F2 Breda, Netherlands | Futures | Clay | Tomislav Brkić | Karim-Mohamed Maamoun Ilija Vučić | 6–0, 6–2 |
| Win | 4–2 | Mar 2017 | F9 Antalya, Turkey | Futures | Clay | Pedro Sakamoto | Pedro Bernardi Christopher Díaz Figueroa | 6–2, 6–2 |
| Win | 5–2 | Jun 2017 | F3 Jablonec nad Nisou, Czech Republic | Futures | Clay | Jan Choinski | Petr Michnev Matěj Vocel | 7–6(7–4), 6–3 |
| Result | Year | Tournament | Surface | Partner | Opponents | Score |
| Win | 2013 | US Open | Hard | Martin Redlicki | Quentin Halys Frederico Ferreira Silva | 6–3, 6–4 |
| Result | Year | Tournament | Surface | Opponent | Score |
| Gold | 2014 | Nanjing Youth Olympics | Hard | Orlando Luz | 6–4, 7–5 |
| Result | Year | Tournament | Surface | Partner | Opponents | Score |
| Bronze | 2014 | Nanjing Youth Olympics | Hard | Fanny Stollár | Ioana Ducu Matías Zukas | 6–3, 3–6, [10–5] |
| Season | 2019 | 2025 | Total |
| Wins | 0 | 1 | 1 |
| # | Player | Rank | Event | Surface | Rd | Score | KMR |
| 2025 | |||||||
| 1. | Karen Khachanov | 9 | US Open, United States | Hard | 2R | 2–6, 6–7(4–7), 6–4, 7–5, 7–6(10–5) | 76 |