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| 1/16-finals | Pislak M. | Koelzer R. | 2:0 (6:1, 6:3) | dettagli | 27.04.2021 | ||
| 1/16-finals | Koelzer R. | Kudermetova P. | 0:2 (5:7, 4:6) | dettagli | 20.04.2021 | ||
| 1/16-finals | Lee S. | Koelzer R. | 2:1 (2:6, 6:2, 6:0) | dettagli | 14.04.2021 | ||
| Quarter-finals | Amiraghyan A. | Koelzer R. | WO. | dettagli | 20.11.2020 | ||
| 1/8-finals | Sakellaridi S. | Koelzer R. | 0:2 (3:6, 2:6) | dettagli | 19.11.2020 | ||
| 1/16-finals | Kimchi S. | Koelzer R. | 0:2 (2:6, 4:6) | dettagli | 18.11.2020 | ||
| Final | Ignatik A. | Koelzer R. | 1:2 (3:6, 6:1, 2:6) | dettagli | 15.11.2020 | ||
| Semi-finals | Koelzer R. | Khirin N. | 2:0 (6:1, 6:1) | dettagli | 14.11.2020 | ||
| Quarter-finals | Koelzer R. | Poznikhirenko G. | 2:1 (6:3, 4:6, 7:5) | dettagli | 13.11.2020 | ||
| 1/8-finals | Topalova G. | Koelzer R. | 0:2 (4:6, 4:6) | dettagli | 13.11.2020 | ||
| 1/16-finals | Koelzer R. | Viertler M. | 2:0 (6:2, 6:2) | dettagli | 12.11.2020 | ||
| Final | Koelzer R. | Topalova G. | 0:2 (4:6, 0:6) | dettagli | 08.11.2020 | ||
| Semi-finals | Rosca A. | Koelzer R. | 1:2 (2:6, 6:3, 2:6) | dettagli | 07.11.2020 | ||
| Quarter-finals | Koelzer R. | Markova J. | 2:1 (6:4, 4:6, 6:4) | dettagli | 06.11.2020 | ||
| 1/8-finals | Koelzer R. | Delai M. | 2:1 (4:6, 6:2, 6:3) | dettagli | 05.11.2020 | ||
| 1/16-finals | Detiuc A. | Koelzer R. | 1:2 (6:4, 0:6, 0:6) | dettagli | 03.11.2020 | ||
| Semi-finals | Ignatik A. | Koelzer R. | 2:0 (6:3, 6:1) | dettagli | 31.10.2020 | ||
| Quarter-finals | Rosca I. L. | Koelzer R. | 1:2 (3:6, 6:2, 4:6) | dettagli | 31.10.2020 | ||
| 1/8-finals | Koelzer R. | Astakhova D. | 2:1 (6:4, 0:6, 6:3) | dettagli | 30.10.2020 | ||
| 1/16-finals | Pavlou D. | Koelzer R. | 1:2 (1:6, 7:65, 0:6) | dettagli | 27.10.2020 | ||
| Koelzer R. | Klasen A. | 2:0 (7:66, 7:67) | dettagli | 28.08.2020 | |||
| Gettwart F. | Koelzer R. | 0:2 (2:6, 3:6) | dettagli | 27.08.2020 | |||
| Koelzer R. | Cadar E.-T. | 2:0 (6:4, 6:4) | dettagli | 26.08.2020 | |||
| Morderger Y. | Koelzer R. | 2:1 (2:6, 7:63, 6:4) | dettagli | 25.08.2020 | |||
| Koelzer R. | Matviyenko L. | 2:0 (6:4, 6:2) | dettagli | 24.08.2020 | |||
| Koelzer R. | Klasen Ch. | 2:0 (6:3, 6:0) | dettagli | 21.08.2020 | |||
| Hering K. | Koelzer R. | 2:0 (6:3, 7:5) | dettagli | 20.08.2020 | |||
| Koelzer R. | Boehner L. | 2:0 (6:1, 6:3) | dettagli | 19.08.2020 | |||
| Rosca A. | Koelzer R. | 2:0 (7:61, 6:0) | dettagli | 18.08.2020 | |||
| Koelzer R. | Ambrosio S. | 2:1 (5:7, 6:4, 6:1) | dettagli | 17.08.2020 | |||
| Koelzer R. | Hering K. | 2:0 (6:3, 6:3) | dettagli | 07.08.2020 | |||
| Morderger Y. | Koelzer R. | 2:0 (6:0, 6:0) | dettagli | 06.08.2020 | |||
| Hogenkamp R. | Koelzer R. | 2:0 (6:2, 6:4) | dettagli | 05.08.2020 | |||
| Koelzer R. | Kanev K. | 2:0 (6:1, 6:4) | dettagli | 04.08.2020 | |||
| Gavrila O. | Koelzer R. | 1:2 (6:1, 3:6, 4:6) | dettagli | 03.08.2020 | |||
| Koelzer R. | Zanevska M. | 2:0 (7:5, 6:4) | dettagli | 31.07.2020 | |||
| Koelzer R. | Lukacs V. | 2:0 (6:4, 6:3) | dettagli | 30.07.2020 | |||
| Koelzer R. | Morderger T. | 2:0 (6:1, 6:4) | dettagli | 29.07.2020 | |||
| Koelzer R. | Schmidt A. | 2:0 (6:4, 6:0) | dettagli | 28.07.2020 | |||
| Koelzer R. | Klasen Ch. | 2:1 (6:2, 3:6, 8:6) | dettagli | 27.07.2020 | |||
| Siegemund L. | Koelzer R. | 2:1 (4:6, 6:0, 6:1) | dettagli | 18.07.2020 | |||
| 3rd place | Koelzer R. | Hodzic M. | 2:0 (6:2, 6:2) | dettagli | 03.07.2020 | ||
| Group 1 | Niemeier J. | Koelzer R. | 2:0 (7:63, 7:5) | dettagli | 02.07.2020 | ||
| Group 1 | Koelzer R. | Hodzic M. | 2:0 (7:66, 6:4) | dettagli | 01.07.2020 | ||
| 1/8-finals | Koelzer R./Schmidt A. | Hrabalova K./Svatikova L. | 1:2 (6:7, 7:6, 4:10) | dettagli | 12.11.2020 | ||
| Semi-finals | Rusova A./Stadler N. | Koelzer R./Schaeder L. | 2:1 (1:6, 6:4, 10:7) | dettagli | 06.11.2020 | ||
| Quarter-finals | Gaspar I./Masarova R. | Koelzer R./Schaeder L. | WO. | dettagli | 05.11.2020 | ||
| 1/8-finals | Koelzer R./Schaeder L. | Detiuc A./Kilnarova M. | 2:1 (0:6, 6:4, 10:8) | dettagli | 03.11.2020 | ||
| 1/8-finals | Halbauer E./Koelzer R. | Crescenzi G./Lavino I. | 1:2 (0:6, 7:61, 7:10) | dettagli | 27.10.2020 | ||
| 1/8-finals | Loeb J./Sanchez A. S. | Koelzer R./Murta I. | 2:0 (6:2, 7:5) | dettagli | 29.09.2020 | ||