| ITF Romania F16 | 09/09 12:50 | 27 | Willems, Johann v 보르자, 보그단 | 2-6,6-4,6-4 | |
| ITF Romania F16 | 09/08 06:30 | 26 | 드 빈센티스, 마테오 v Willems, Johann | 5-7,3-6 | |
| ITF Romania F16 | 09/07 14:25 | 25 | Willems, Johann v 마놀, 알렉산드루 바실 | 6-3,6-1 | |
| ITF Belgium F11 | 08/24 10:55 | 26 | Willems, Johann v Farquharson, Tom | 5-7,2-6 | |
| ITF Belgium F11 | 08/23 08:00 | 25 | Willems, Johann v 미쟈나, 레니 | 6-4,6-2 | |
| ITF Germany F11 | 08/18 13:30 | 26 | 보엘러, 도미니크 v Willems, Johann | 6-2,7-5 | |
| ITF Germany F11 | 08/17 10:00 | 25 | Willems, Johann v 케른, 로빈 | 6-4,6-4 | |
| ITF Germany F9 | 08/04 14:00 | 27 | Willems, Johann v 나카가와, 나오키 | 7-5,5-7,6-7 | |
| ITF Germany F9 | 08/04 08:00 | 26 | 바네스, 마베리크 v Willems, Johann | 1-6,3-6 | |
| ITF Germany F9 | 08/02 14:00 | 25 | Gawron, Marcin v Willems, Johann | 3-6,5-7 | |
| ITF Germany F9 | 08/01 14:30 | 62 | Willems, Johann v Weyhausen, Arnd | 6-2,6-3 | |
| ITF Germany F8 Qual | 07/18 14:35 | 62 | Willems, Johann v von Hindte, Leonard | 0-6,0-6 | |
| ITF Germany F8 Qual | 07/17 15:45 | 62 | 엘카디, 오마르 v Willems, Johann | 7-6,2-6,2-6 | |
| ITF Germany F6 | 07/09 12:00 | 28 | Willems, Johann v 네터스칠, 마르빈 | 3-6,3-6 | |
| ITF Germany F6 | 07/08 16:45 | 27 | Willems, Johann v 라즈보르세크, 니크 | 6-3,7-6 | |
| ITF Germany F6 | 07/07 16:05 | 26 | Sieber, Marc v Willems, Johann | 4-6,3-6 | |
| ITF Germany F6 | 07/06 10:00 | 25 | Willems, Johann v Venturino, Thibault | 6-3,6-3 | |
| ITF Germany F6 | 07/04 10:00 | 44 | 제벤스, 헨드리크 v Willems, Johann | 6-7,6-7 | |
| ITF Germany F6 | 07/03 12:00 | 44 | 로데스치, 크리스 v Willems, Johann | 1-6,1-6 | |
| ITF Germany F5 | 06/29 10:00 | 25 | 제벤스, 헨드리크 v Willems, Johann | 5-7,7-5,6-1 | |
| ITF Germany F5 | 06/26 09:00 | 54 | 반 델 호스트, 팀 v Willems, Johann | 2-6,1-6 | |
| ITF Germany F2 Qual | 01/17 12:00 | 62 | 보엘러, 도미니크 v Willems, Johann | 6-4,7-6 | |
| ITF Turkey F41 | 10/14 07:00 | 25 | 보브로브, 보그단 v Willems, Johann | 7-6,6-1 | |
| ITF Turkey F41 | 10/12 07:00 | 62 | Haylaz, Muhammet v Willems, Johann | 3-6,6-4,6-1 | |
| ITF Turkey F36 | 10/04 12:00 | 62 | 네마, 파트리크 v Willems, Johann | 6-3,6-4 | |
| ITF Netherlands F6 | 08/25 13:50 | 25 | 덴 헤이젤, 구이 v Willems, Johann | 2-6,7-6,6-2 | |
| ITF Netherlands F6 | 08/23 12:10 | 62 | van Den Honert, Vincent v Willems, Johann | 3-6,1-6 | |
| ITF Netherlands F6 | 08/22 08:00 | 62 | 헤르만스, 매트스 v Willems, Johann | 1-6,4-6 | |
| ITF Netherlands F4 | 07/05 08:00 | - | 데 발크, 로이 사루트 v Willems, Johann | 7-5,6-7,5-7 | |
| ITF Netherlands F4 | 07/04 08:00 | - | Willems, Johann v Goluza, Ivan | 6-2,6-3 |