Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| ITF Belarus F2 | 2017/08/16 07:00 | Marek Gengel v Marat Deviatiarov | 2-6,6-2,3-6 |
| ITF M15 Jerusalem | 2021/05/13 07:00 | Justin Roberts v Marat Deviatiarov | 6-1,6-2 |
| ITF M15 Jerusalem | 2021/05/12 07:00 | Alec Beckley v Marat Deviatiarov | 1-6,6-7 |
| ITF M15 Ramat Hasharon | 2021/05/07 07:00 | Marat Deviatiarov v Felix Corwin | 5-7,4-6 |
| ITF M15 Ramat Hasharon | 2021/05/06 10:30 | Marat Deviatiarov v Lior Goldenberg | 6-3,6-2 |
| ITF M15 Ramat Hasharon | 2021/05/05 09:10 | Marat Deviatiarov v Roee Benya | 7-6,6-0 |
| ITF M15 St Petersburg | 2021/04/15 07:00 | Naoki Tajima v Marat Deviatiarov | 7-6,6-3 |
| ITF M15 St Petersburg | 2021/04/14 07:00 | Maxim Ratniuk v Marat Deviatiarov | 7-6,6-7,6-7 |
| ITF M15 Sharm El Sheikh | 2021/03/31 09:50 | Marat Deviatiarov v Alessandro Bega | 0-6,3-6 |
| ITF M15 Jerusalem | 2021/05/14 07:30 | Zane Khan v Marek Gengel | 7-5,7-6 |
| ITF M15 Jerusalem | 2021/05/13 10:35 | Alexandros Skorilas v Marek Gengel | 2-6,1-6 |
| ITF M15 Jerusalem | 2021/05/12 10:00 | Lorenzo Lorusso v Marek Gengel | 6-7,4-6 |
| Challenger Salinas 2 | 2021/04/27 17:20 | Hernan Casanova v Marek Gengel | 3-6,6-4,7-5 |
| Challenger Salinas 2 | 2021/04/26 21:00 | Gage Brymer v Marek Gengel | 4-6,7-5,2-6 |
| Challenger Salinas | 2021/04/20 14:30 | Marek Gengel v Tak Khunn Wang | 2-6,3-6 |
| Challenger Salinas | 2021/04/19 16:55 | Marek Gengel v Mathieu Perchicot | 6-3,3-6,7-5 |
| Challenger Salinas | 2021/04/18 16:55 | Marek Gengel v Omar Suarez | 6-1,6-1 |