 Brazil: Piracicaba - Singles - Main |
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| Quarter-finals | Feldbausch K. | Ugo Carabelli C. | 0:2 (1:6, 4:6) | details | 02.02.2024 |
| 1/8-finals | Stodder T. | Feldbausch K. | 0:2 (63:7, 1:6) | details | 01.02.2024 |
| 1/16-finals | Sanchez Izquierdo N. | Feldbausch K. | 0:2 (4:6, 4:6) | details | 30.01.2024 |
| Brazil: Piracicaba - Singles - Qualification |
|---|
| Final | Feldbausch K. | Marti Pujolras A. | 1:1 RET. (4:6, 7:65, 4:1) | details | 29.01.2024 |
| Semi-finals | Feldbausch K. | Saraiva Dos Santos P. A. | 2:1 (3:6, 6:3, 6:4) | details | 28.01.2024 |
 Spain: Maspalomas - Singles - Main |
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| Final | Martinez P. | Feldbausch K. | 2:1 (6:4, 4:6, 6:3) | details | 03.12.2023 |
| Semi-finals | Rincon D. | Feldbausch K. | 0:2 (3:6, 1:6) | details | 02.12.2023 |
| Quarter-finals | Feldbausch K. | Lopez Morillo I. | 2:0 (6:2, 6:2) | details | 01.12.2023 |
| 1/8-finals | Krutykh O. | Feldbausch K. | 1:2 (6:3, 3:6, 1:6) | details | 30.11.2023 |
| 1/16-finals | Alvarez Varona N. | Feldbausch K. | 0:0 RET. (2:4) | details | 28.11.2023 |
 USA: M15 Boca Raton, FL - Singles - Main |
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| Final | Feldbausch K. | Johns G. | 2:0 (6:4, 7:5) | details | 19.11.2023 |
| Semi-finals | Gomez F. A. | Feldbausch K. | 0:2 (1:6, 3:6) | details | 18.11.2023 |
| Quarter-finals | Popko D. | Feldbausch K. | 0:2 (2:6, 3:6) | details | 17.11.2023 |
| 1/8-finals | Camus C. | Feldbausch K. | 0:2 (0:6, 0:6) | details | 17.11.2023 |
| 1/16-finals | Lyeons J. | Feldbausch K. | 0:2 (0:6, 5:7) | details | 16.11.2023 |
 Peru: Lima 2 - Singles - Main |
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| 1/16-finals | Darderi L. | Feldbausch K. | 2:1 (6:4, 3:6, 7:5) | details | 07.11.2023 |
| Peru: Lima 2 - Singles - Qualification |
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| Final | Feldbausch K. | Mejia N. | 2:0 (6:2, 7:64) | details | 06.11.2023 |
| Semi-finals | Heide G. | Feldbausch K. | 1:2 (6:1, 2:6, 4:6) | details | 05.11.2023 |
 Ecuador: Guayaquil - Singles - Main |
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| 1/16-finals | Feldbausch K. | Galan D. E. | 1:1 RET. (3:6, 7:64, 0:5) | details | 31.10.2023 |
 Italy: M25 Santa Margherita di Pula 9 - Singles - Main |
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| 1/8-finals | Stodder T. | Feldbausch K. | 2:1 (4:6, 6:4, 6:1) | details | 11.10.2023 |
| 1/16-finals | Prinoth P. | Feldbausch K. | 0:2 (1:6, 0:6) | details | 09.10.2023 |
| 1/16-finals | Compagnucci T. | Feldbausch K. | CAN. | details | 09.10.2023 |
| Italy: M25 Santa Margherita di Pula 8 - Singles - Main |
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| Quarter-finals | Oliveira G. | Feldbausch K. | 2:1 (6:3, 3:6, 6:2) | details | 05.10.2023 |
| 1/8-finals | Feldbausch K. | Kivattsev K. | 2:1 (61:7, 7:5, 7:5) | details | 04.10.2023 |
| 1/16-finals | Tabacco G. | Feldbausch K. | 1:2 (2:6, 6:4, 4:6) | details | 03.10.2023 |
 Portugal: Braga - Singles - Main |
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| 1/16-finals | Piros Z. | Feldbausch K. | 2:1 (3:6, 7:5, 6:3) | details | 25.09.2023 |
 Switzerland: M25 Sion - Singles - Main |
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| Quarter-finals | Bertola R. | Feldbausch K. | 2:0 (6:4, 7:5) | details | 01.09.2023 |
| 1/8-finals | Lopez N. | Feldbausch K. | 0:2 (2:6, 4:6) | details | 31.08.2023 |
| 1/16-finals | Feldbausch K. | Ferrari G. | 2:0 (6:3, 6:2) | details | 29.08.2023 |
| Switzerland: M15 Caslano - Singles - Main |
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| 1/16-finals | Sorrentino L. | Feldbausch K. | 2:1 (1:6, 7:5, 7:5) | details | 22.08.2023 |
| Switzerland: M25 Muttenz - Singles - Main |
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| 1/16-finals | Feldbausch K. | Von der Schulenburg J. | 0:2 (5:7, 4:6) | details | 16.08.2023 |
 Germany: Meerbusch - Singles - Main |
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| 1/8-finals | Feldbausch K. | Rincon D. | 0:2 (2:6, 1:6) | details | 10.08.2023 |
| 1/16-finals | Feldbausch K. | Houkes M. | 2:0 (7:5, 6:4) | details | 08.08.2023 |
 Austria: Kitzbuhel - Singles - Qualification |
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| Semi-finals | Feldbausch K. | Gakhov I. | 0:2 (4:6, 60:7) | details | 29.07.2023 |
| Switzerland: Zug - Singles - Main |
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| 1/16-finals | Feldbausch K. | Fognini F. | 0:2 (4:6, 2:6) | details | 25.07.2023 |
| Switzerland: Gstaad - Singles - Qualification |
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| Semi-finals | Bagnis F. | Feldbausch K. | 2:0 (7:63, 6:3) | details | 15.07.2023 |
| Switzerland: M25 Klosters - Singles - Main |
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| 1/16-finals | Debru G. | Feldbausch K. | 2:1 (6:4, 65:7, 6:4) | details | 04.07.2023 |
| Italy: Roseto Degli Abruzzi - Singles - Main |
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| 1/8-finals | Feldbausch K. | Agamenone F. | 0:2 (0:6, 1:6) | details | 20.04.2023 |
| 1/16-finals | Navone M. | Feldbausch K. | 0:2 (65:7, 0:6) | details | 19.04.2023 |
 Australia: Australian Open - Singles - Main |
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| Quarter-finals | Feldbausch K. | Zhou Y. | 1:2 (5:7, 7:5, 4:6) | details | 26.01.2023 |
| 1/8-finals | Feldbausch K. | Kang K. | 2:1 (6:4, 61:7, 6:4) | details | 25.01.2023 |
| 1/16-finals | Feldbausch K. | Dodig M. | 2:0 (6:2, 6:1) | details | 23.01.2023 |
| 1/32-finals | Feldbausch K. | Gadecki T. N. | 2:0 (6:1, 6:3) | details | 21.01.2023 |
 Qatar: M15 Doha - Singles - Main |
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| 1/8-finals | Sharipov M. | Feldbausch K. | 2:1 (6:3, 1:6, 6:4) | details | 12.01.2023 |