| Challenger Ann Arbor | 01/08 20:20 | 25 | Ruben Bemelmans v Aleksandar Kovacevic | 2-6,4-6 | |
| Challenger Bratislava | 11/04 10:20 | 24 | [154] Federico Gaio v Ruben Bemelmans [256] | 1-6,6-4,6-3 | |
| Challenger Eckental | 10/29 17:40 | 25 | [217] Ruben Bemelmans v Oscar Otte [161] | 6-4,2-6,3-6 | |
| Challenger Eckental | 10/28 14:15 | 24 | [217] Ruben Bemelmans v Aslan Karatsev [271] | 6-2,6-3 | |
| Challenger Hamburg | 10/23 08:00 | 25 | [205] Ruben Bemelmans v Elias Ymer [130] | 7-6,6-7,3-6 | |
| Challenger Hamburg | 10/21 14:55 | 24 | [269] John-Patrick Smith v Ruben Bemelmans [205] | 5-7,4-6 | |
| ATP Antwerp | 10/13 14:35 | 64 | Marius Copil v Ruben Bemelmans | 6-4,6-4 | |
| Challenger Nur-Sultan 2 | 10/05 06:00 | 28 | [378] Illya Marchenko v Ruben Bemelmans [225] | 1-6,7-6,6-4 | |
| Challenger Nur-Sultan 2 | 10/04 05:00 | 27 | [225] Ruben Bemelmans v Evgeny Donskoy [116] | 6-1,3-6,6-3 | |
| Challenger Nur-Sultan 2 | 10/03 05:00 | 26 | [164] Denis Istomin v Ruben Bemelmans [225] | Retired | |
| Challenger Nur-Sultan 2 | 10/02 06:10 | 25 | [380] Ivan Gakhov v Ruben Bemelmans [225] | 4-6,3-6 | |
| Challenger Orleans | 09/25 09:00 | 25 | [136] Yannick Maden v Ruben Bemelmans [202] | 4-6,7-6,7-6 | |
| Challenger Orleans | 09/24 10:15 | 24 | [202] Ruben Bemelmans v Mirza Basic [219] | 7-6,6-3 | |
| Challenger Glasgow | 09/18 12:35 | 25 | [198] Ruben Bemelmans v Antoine Escoffier [399] | 4-6,4-6 | |
| Challenger Istanbul | 09/13 10:45 | 27 | [72] Ugo Humbert v Ruben Bemelmans [212] | 6-7,7-5,6-2 | |
| Challenger Istanbul | 09/12 08:50 | 26 | [212] Ruben Bemelmans v Lukas Rosol [145] | 6-4,6-3 | |
| Challenger Istanbul | 09/10 07:00 | 25 | [212] Ruben Bemelmans v Mircea-Alexandru Jecan [301] | 6-2,7-5 | |
| US Open | 08/22 17:20 | 45 | [181] Ruben Bemelmans v Ilya Ivashka [143] | 4-6,3-6 | |
| US Open | 08/20 21:45 | 44 | [181] Ruben Bemelmans v Hiroki Moriya [213] | 6-1,7-6 | |
| Challenger Vancouver | 08/13 17:00 | 25 | [186] Ruben Bemelmans v Jason Jung [129] | 4-6,2-6 | |
| Challenger Vancouver | 08/12 20:30 | 24 | Liam Draxl v Ruben Bemelmans | 4-6,5-7 | |
| Challenger Aptos | 08/06 21:25 | 25 | [465] Alexander Sarkissian v Ruben Bemelmans [190] | 6-7,6-1,6-2 | |
| Wimbledon | 07/01 10:00 | 23 | [19] Stan Wawrinka v Ruben Bemelmans [171] | 6-3,6-2,6-2 | |
| Wimbledon | 06/27 10:00 | 25 | [171] Ruben Bemelmans v Donald Young [200] | 6-4,6-4,6-1 | |
| Wimbledon | 06/26 10:00 | 45 | [171] Ruben Bemelmans v Akira Santillan [238] | 6-7,6-3,12-10 | |
| Wimbledon | 06/24 11:40 | 44 | [120] Elias Ymer v Ruben Bemelmans [171] | 3-6,7-6,4-6 | |
| Challenger Ilkley | 06/20 14:55 | 26 | [175] Ruben Bemelmans v Antoine Hoang [111] | 1-6,1-6 | |
| Challenger Ilkley | 06/19 18:35 | 25 | [211] Evgeny Karlovskiy v Ruben Bemelmans [175] | 4-6,1-6 | |
| Challenger Ilkley | 06/18 10:00 | 24 | [159] Tatsuma Ito v Ruben Bemelmans [175] | 7-6,3-6,4-6 | |
| Challenger Nottingham | 06/15 13:20 | 27 | [185] Ruben Bemelmans v Antoine Hoang [118] | 3-6,4-6 |