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.

Challenger finals Singles: 3 (0–3) Legend ATP Challenger Tour (0–3)

ResultNo.Date (Final)TournamentSurfaceOpponentScoreLoss 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

Doubles: 9 (1–8)

Result No. Date Tournament Surface Partner Opponents in the final ScoreLoss 1. 4 September 2005 Kyiv, Ukraine Clay Lukáš Dlouhý Diego Junqueira Martín Vassallo Argüello 4–6, 2–6Loss 2. 9 July 2006 Pozoblanco, Spain Hard Ivo Klec Justin Gimelstob Kevin Kim 3–6, 5–7Loss 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, 4–6Loss 5. 18 March 2007 Sarajevo, Bosnia and Herzegovina Hard (i) Lukáš Rosol Ernests Gulbis Deniss Pavlovs 4–6, 3–6Loss 6. 3 June 2007Busan, 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, 4–6Win 8. 7 February 2010 Kazan, Russia Hard (i) Yuri Schukin Tobias Kamke Julian Reister 6–2, 6–4Loss 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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