Stadium: Court 4 Round: 27 Ground: Clay
| ITF M25 Santander | 2023/08/23 17:00 | 니부어, 리얀 v Sergio Callejon Hernando | 6-1,7-6 |
| ITF M25 Santander | 2023/08/22 11:10 | 니부어, 리얀 v 마르티네즈, 미켈 | 6-1,6-2 |
| ITF M15 Xativa | 2023/08/05 15:00 | Carlos Lopez Montagud v 니부어, 리얀 | 6-1,6-1 |
| ITF M15 Xativa | 2023/08/04 16:25 | 니부어, 리얀 v Sergio Callejon Hernando | 6-2,6-3 |
| ITF M15 Xativa | 2023/08/03 16:30 | 니부어, 리얀 v Alejandro T Alvarez | 6-1,6-3 |
| ITF M15 Xativa | 2023/08/01 15:30 | 니부어, 리얀 v Toprak Avcibasi | 7-6,6-7,6-4 |
| ITF M25 Denia | 2023/07/26 16:25 | 페레즈 콘트리, 세르지 v 니부어, 리얀 | 6-4,6-3 |
| Challenger Amersfoort | 2023/07/17 10:55 | 비스커, 니엘스 v 니부어, 리얀 | 7-6,3-6,7-5 |
| ITF M25 Santander | 2023/08/23 12:20 | Svyatoslav Gulin v Fnu Nidunjianzan | 6-4,3-6,6-0 |
| ITF M25 Santander | 2023/08/22 07:55 | Alejo Sanchez Quilez v Svyatoslav Gulin | 6-1,2-6,4-6 |
| ITF M15 Kottingbrunn | 2023/08/17 08:00 | Svyatoslav Gulin v Joel Schwaerzler | 1-6,1-6 |
| ITF M15 Kottingbrunn | 2023/08/15 08:00 | 프레치텔, 세바스티안 v Svyatoslav Gulin | 3-6,6-7 |
| ITF M15 Uslar | 2023/07/18 10:00 | 프레치텔, 세바스티안 v Svyatoslav Gulin | 6-1,6-3 |
| ITF M25 Kassel | 2023/07/14 14:10 | Svyatoslav Gulin v 파울슨, 안드루 | 2-6,2-6 |
| ITF M25 Kassel | 2023/07/13 11:00 | 메트레벨리, 알렉산드레 v Svyatoslav Gulin | 1-6,3-6 |
| ITF M25 Kassel | 2023/07/12 12:15 | Svyatoslav Gulin v Wiskandt, Max | 6-4,6-4 |