| ATP - Geneva | 05/20 10:15 | 14 | [305] Nino Serdarusic v Marek Gengel [281] | 6-1,6-4 | |
| Challenger - Praag - Kwal. | 05/07 14:20 | 14 | [283] Marek Gengel v Akira Santillan [422] | 2-6,0-6 | |
| Challenger - Praag | 04/30 11:25 | 14 | [296] Joao Domingues v Marek Gengel [283] | 4-6,6-1,6-2 | |
| Challenger - Rome | 04/25 10:05 | 25 | [234] Jesper De Jong v Marek Gengel [283] | 6-3,6-2 | |
| ATP - Barcelona | 04/15 15:40 | 14 | [279] Marek Gengel v Jozef Kovalik [155] | 3-6,2-6 | |
| ITF M25 - Sharm El Sheikh | 04/13 09:25 | 26 | Marek Gengel v Kris Van Wyk | 6-1,5-7,2-6 | |
| ITF M25 - Sharm El Sheikh | 04/12 10:40 | 25 | Marek Gengel v Alec Beckley | 7-6,6-1 | |
| ATP - Marrakech | 04/02 10:30 | 14 | [267] Marek Gengel v Arthur Cazaux [218] | 3-6,1-6 | |
| ITF M25 - Trnava | 03/30 09:30 | 26 | [267] Marek Gengel v Sarp Agabigun [465] | 4-6,6-2,6-7 | |
| ITF M25 - Trnava | 03/29 14:15 | 25 | Marek Gengel v Marek Nano | 6-1,6-2 | |
| Challenger - Biel | 03/21 15:15 | 25 | [422] Marius Copil v Marek Gengel [267] | 6-4,6-3 | |
| Challenger - Lugano | 03/06 11:00 | 19 | Marek Gengel v Calvin Hemery | 2-6,3-6 | |
| Challenger - Lugano | 03/05 13:05 | 14 | Marek Gengel v Luca Margaroli | 6-2,6-4 | |
| Challenger - Pune | 02/27 08:30 | 25 | [210] Rio Noguchi v Marek Gengel [269] | 4-6,6-2,7-6 | |
| Challenger - Rovereto | 02/22 11:20 | 25 | [269] Marek Gengel v Jan Choinski [225] | 1-6,4-6 | |
| Challenger Manama | 02/15 08:00 | 26 | [264] Marek Gengel v Salvatore Caruso [380] | 1-6,2-6 | |
| Challenger Manama | 02/13 12:45 | 25 | [268] Filip C Jianu v Marek Gengel [264] | 6-7,7-6,6-7 | |
| Challenger - Tenerife | 02/07 12:50 | 25 | [445] Oscar Jose Gutierrez v Marek Gengel [258] | 1-6,6-0,6-3 | |
| Challenger - Tenerife | 02/07 12:50 | 25 | Miljan Zekic v Marek Gengel | Cancelled | |
| Challenger - Nonthaburi | 01/12 03:30 | 27 | [145] Dennis Novak v Marek Gengel [264] | 6-3,6-3 | |
| Challenger - Nonthaburi | 01/11 04:20 | 26 | [264] Marek Gengel v Michael Geerts [254] | 2-6,7-6,7-5 | |
| Challenger - Nonthaburi | 01/09 06:45 | 25 | [264] Marek Gengel v Hiroki Moriya [274] | 6-1,6-2 | |
| Challenger - Nonthaburi | 01/05 04:00 | 27 | [282] Marek Gengel v Dennis Novak [180] | 3-6,7-6,3-6 | |
| Challenger - Nonthaburi | 01/04 03:00 | 26 | [357] Henri Squire v Marek Gengel [282] | 4-6,3-6 | |
| Challenger - Nonthaburi | 01/02 08:20 | 25 | [282] Marek Gengel v Tennys Sandgren [265] | 6-4,6-7,6-1 | |
| ITF M25 - Trnava | 12/04 10:00 | 29 | [323] Marek Gengel v Daniel Rincon [472] | 6-7,6-3,6-3 | |
| ITF M25 - Trnava | 12/03 11:20 | 28 | [323] Marek Gengel v Mirza Basic [384] | 7-5,4-6,6-2 | |
| ITF M25 - Trnava | 12/03 09:00 | 26 | Marek Gengel v Pavel Nejedly | Cancelled | |
| ITF M25 - Trnava | 12/02 10:00 | 27 | [323] Marek Gengel v Sandro Kopp [468] | 6-1,6-1 | |
| ITF M25 - Trnava | 12/01 13:10 | 26 | Marek Gengel v Jan Kupcic | 6-2,6-3 |
Marek Gengel (born 17 September 1995) is a Czech tennis player.
Gengel has a career high ATP singles ranking of 256 achieved on 16 January 2023. He also has a career high doubles ranking of 148 achieved on 20 March 2023.
Gengel has won 1 ATP Challenger doubles title at the 2023 Nonthaburi Challenger with Adam Pavlásek.