| Challenger Playford | 01/01 06:50 | 25 | [204] Arthur De Greef v Casper Ruud [112] | 1-6,3-6 | |
| Challenger Playford | 12/31 04:50 | 24 | [199] Stefano Napolitano v Arthur De Greef [204] | 3-6,6-3,5-7 | |
| Challenger Buenos Aires | 11/14 16:00 | 26 | [230] Arthur De Greef v Pablo Andujar [99] | 1-6,2-6 | |
| Challenger Buenos Aires | 11/12 17:35 | 25 | [230] Arthur De Greef v Gastao Elias [290] | 6-4,6-3 | |
| Challenger Montevideo | 11/06 19:20 | 25 | [239] Facundo Arguello v Arthur De Greef [232] | 5-7,6-3,6-3 | |
| Challenger Guayaquil | 11/02 23:15 | 28 | [255] Arthur De Greef v Pedro Sousa [124] | 5-7,2-6 | |
| Challenger Guayaquil | 11/01 23:15 | 27 | [65] Pablo Cuevas v Arthur De Greef [255] | 5-7,3-6 | |
| Challenger Guayaquil | 10/31 19:55 | 26 | [255] Arthur De Greef v Jose Hernandez-Fernandez [244] | 6-0,6-4 | |
| Challenger Guayaquil | 10/30 17:55 | 25 | [210] Daniel Elahi Galan v Arthur De Greef [255] | 4-6,0-6 | |
| Challenger Lima | 10/23 19:10 | 25 | [254] Arthur De Greef v Pedro Sousa [138] | 3-6,3-6 | |
| Challenger Barcelona | 10/10 11:15 | 25 | [256] Arthur De Greef v Tak Khunn Wang [445] | 3-6,6-3,6-7 | |
| Challenger Florence | 10/04 13:50 | 26 | [89] Lorenzo Sonego v Arthur De Greef [246] | 6-2,5-7,6-4 | |
| Challenger Florence | 10/03 09:50 | 25 | [246] Arthur De Greef v Jelle Sels [275] | 6-2,6-2 | |
| Challenger Florence | 10/02 08:00 | 25 | Arthur De Greef v Luca Vanni | Cancelled | |
| Challenger Genova | 09/02 11:20 | 45 | [253] Arthur De Greef v Andreas Haider-Maurer [436] | Retired | |
| Challenger Como | 08/26 11:40 | 46 | [247] Arthur De Greef v Gianluca Mager [300] | 4-6,6-4,1-6 | |
| Challenger Como | 08/25 15:25 | 45 | Arthur De Greef v Gianluca Di Nicola | 7-6,7-5 | |
| Challenger Meerbusch | 08/13 15:45 | 25 | [280] Bernabe Zapata Miralles v Arthur De Greef [249] | 6-4,6-2 | |
| Challenger Pullach | 08/07 09:00 | 25 | [247] Arthur De Greef v Kimmer Coppejans [297] | 2-6,7-5,1-6 | |
| Challenger Pullach Qual | 08/06 10:00 | 54 | [247] Arthur De Greef v Gianluca Mager [339] | 4-6,6-7 | |
| Challenger Pullach Qual | 08/05 10:00 | 46 | Arthur De Greef v Juan Pablo Paz | 6-4,3-6,6-1 | |
| Challenger Pullach Qual | 08/04 09:00 | 45 | Arthur De Greef v Manuel Pena Lopez | 6-7,6-3,7-5 | |
| Challenger Padova | 07/26 08:30 | 26 | [254] Arthur De Greef v Ante Pavic [248] | 4-6,7-6,4-6 | |
| Challenger Padova | 07/24 10:30 | 25 | [258] Facundo Arguello v Arthur De Greef [254] | Retired | |
| Challenger San Benedetto | 07/17 10:00 | 25 | [162] Nikola Milojevic v Arthur De Greef [244] | 6-4,7-5 | |
| Challenger Braunschweig | 07/13 13:00 | 28 | [117] Jozef Kovalik v Arthur De Greef [254] | 6-2,6-3 | |
| Challenger Braunschweig | 07/12 12:15 | 27 | [254] Arthur De Greef v Hugo Dellien [120] | 6-4,6-1 | |
| Challenger Braunschweig | 07/11 09:00 | 26 | [254] Arthur De Greef v Rogerio Dutra Silva [135] | 6-4,7-6 | |
| Challenger Braunschweig | 07/09 14:55 | 25 | [91] Florian Mayer v Arthur De Greef [254] | 6-7,6-2,2-6 | |
| Wimbledon Qual | 06/25 15:40 | 44 | [256] Arthur De Greef v Jason Kubler [147] | 1-6,2-6 |