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Jan Mertl (born 3 January 1982) is a Czech former tennis player who competed mainly on the ITF Futures Tour and ATP Challenger Tour. On 23 July 2007, he reached his highest ATP singles ranking of 163.
Mertl made his ATP main draw debut at 2016 Swiss Open Gstaad, defeating Yann Marti to score his first ATP-level win.
Mertl is the coach of Czech WTA player Markéta Vondroušová.
| ATP Challenger Tour (0–3) |
| Loss | 1. | 18 March 2007 | Sarajevo, Bosnia and Herzegovina | Hard (i) | Ernests Gulbis | 6–4, 4–6, 6–7(2–7) |
| Loss | 2. | 18 March 2012 | Sarajevo, Bosnia and Herzegovina | Hard (i) | Jan Hernych | 3–6, 6–3, 6–7(5–7) |
| Loss | 3. | 24 March 2012 | Bath, Great Britain | Hard | Dustin Brown | 6–7(1–7), 4–6 |
| Loss | 1. | 4 September 2005 | Kyiv, Ukraine | Clay | Lukáš Dlouhý | Diego Junqueira Martín Vassallo Argüello | 4–6, 2–6 |
| Loss | 2. | 9 July 2006 | Pozoblanco, Spain | Hard | Ivo Klec | Justin Gimelstob Kevin Kim | 3–6, 5–7 |
| Loss | 3. | 16 July 2006 | Poznań, Poland | Clay | Vasilis Mazarakis | Tomasz Bednarek Michał Przysiężny | 3–6, 6–3, 8–10 |
| Loss | 4. | 4 March 2007 | Wolfsburg, Germany | Carpet (i) | Joshua Goodall | Alexander Peya Lars Uebel | 4–6, 4–6 |
| Loss | 5. | 18 March 2007 | Sarajevo, Bosnia and Herzegovina | Hard (i) | Lukáš Rosol | Ernests Gulbis Deniss Pavlovs | 4–6, 3–6 |
| Loss | 6. | 3 June 2007 | Busan, South Korea | Hard | Nathan Healey | Sergei Bubka John Paul Fruttero | 6–4, 6–7(5–7), 6–10 |
| Loss | 7. | 6 January 2008 | Nouméa, France | Hard | Martin Slanar | Flavio Cipolla Simone Vagnozzi | 4–6, 4–6 |
| Win | 8. | 7 February 2010 | Kazan, Russia | Hard (i) | Yuri Schukin | Tobias Kamke Julian Reister | 6–2, 6–4 |
| Loss | 9. | 17 September 2011 | Sarajevo, Bosnia and Herzegovina | Clay | Matwé Middelkoop | Marco Crugnola Rubén Ramírez Hidalgo | 6–7(3–7), 6–3, 8–10 |
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