 Germany: M15 Allershausen - Doubles - Main |
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| Final | Sanchez Martinez B./Welte M. | Schell N./Schmitz C. | 0:2 (65:7, 3:6) | details | 04.09.2021 |
| Semi-finals | Schell N./Schmitz C. | Galarza J. I./Jorda Sanchis D. | 2:0 (6:4, 6:3) | details | 03.09.2021 |
| Quarter-finals | Naw H./Sabanin Y. | Schell N./Schmitz C. | 0:2 (4:6, 4:6) | details | 02.09.2021 |
| 1/8-finals | Boehler D./Oetzbach A. | Schell N./Schmitz C. | 1:2 (7:5, 5:7, 7:10) | details | 02.09.2021 |
| Germany: M25 Trier - Doubles - Main |
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| Quarter-finals | Agabigun S./Schmitz C. | Handel T./Steinegger Y. | 1:2 (7:65, 4:6, 6:10) | details | 26.08.2021 |
| 1/8-finals | Agabigun S./Schmitz C. | Porteset J./Vermeer M. | 2:0 (6:4, 6:1) | details | 25.08.2021 |
 Netherlands: M15 Oldenzaal - Doubles - Main |
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| Final | Schmitz C./Tsitsipas Pe. | Binding J./Whitehouse M. | 2:0 (7:64, 6:4) | details | 21.08.2021 |
| Semi-finals | Schmitz C./Tsitsipas Pe. | Bocchi L./Eisinga Z. | 2:0 (6:3, 6:4) | details | 21.08.2021 |
| Quarter-finals | Schmitz C./Tsitsipas Pe. | Broom C./Hussey G. | WO. | details | 20.08.2021 |
| 1/8-finals | Schmitz C./Tsitsipas Pe. | Stuurman R./Van Den Berg R. | 2:0 (6:2, 6:2) | details | 17.08.2021 |
| Germany: Meerbusch - Doubles - Main |
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| 1/8-finals | Gonzales R./Johnson H. | Schmitz C./Tsitsipas Pe. | 2:0 (7:62, 6:1) | details | 10.08.2021 |
| Germany: M25 Wetzlar - Doubles - Main |
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| 1/8-finals | Lemstra K./Romios M. C. | Hassan B./Schmitz C. | 2:1 (3:6, 6:2, 10:3) | details | 04.08.2021 |
| Germany: M25 Marburg - Doubles - Main |
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| Quarter-finals | Handel T./Steinegger Y. | Schell N./Schmitz C. | 2:0 (6:2, 6:2) | details | 08.07.2021 |
| Germany: M15 Troisdorf - Doubles - Main |
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| Semi-finals | Added D./Johnson L. | Schmitz C./Wehnelt K. | 2:1 (6:2, 5:7, 10:5) | details | 14.05.2021 |
| Quarter-finals | Schmitz C./Wehnelt K. | Kocevar-Desman T./Naw H. | 2:0 (6:4, 6:3) | details | 13.05.2021 |
| 1/8-finals | Schmitz C./Wehnelt K. | Steinegger Y./Tanner G. L. | 2:1 (3:6, 6:3, 10:6) | details | 12.05.2021 |
 Turkey: M15 Antalya 15 - Doubles - Main |
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| Final | Akkoyun U./Aksu C. | Cacao T./Schmitz C. | 0:2 (4:6, 2:6) | details | 17.04.2021 |
| Semi-finals | Cacao T./Schmitz C. | Maggioli E./Ovcharenko O. | 2:0 (7:5, 6:4) | details | 16.04.2021 |
| Quarter-finals | Faria L./Vernier M. | Cacao T./Schmitz C. | 0:2 (2:6, 4:6) | details | 15.04.2021 |
| 1/8-finals | Basso A./Ferrari G. | Cacao T./Schmitz C. | 0:2 (2:6, 3:6) | details | 13.04.2021 |
| Turkey: M15 Antalya 14 - Doubles - Main |
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| Final | Hassan B./Schmitz C. | Mochizuki S./Noguchi R. | 0:2 (62:7, 2:6) | details | 10.04.2021 |
| Semi-finals | Hassan B./Schmitz C. | Galoppini D./Prihodko O. | 2:0 (7:62, 6:3) | details | 09.04.2021 |
| Quarter-finals | Fayziev S./Kalovelonis M. | Hassan B./Schmitz C. | 0:2 (4:6, 4:6) | details | 08.04.2021 |
| 1/8-finals | Hassan B./Schmitz C. | Dell'Elba V./Vilicich B. | 2:0 (6:2, 6:1) | details | 06.04.2021 |
| Turkey: M15 Antalya 13 - Doubles - Main |
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| Final | Hassan B./Schmitz C. | Llamas Ruiz P./Vives Marcos P. | 2:0 (6:2, 6:1) | details | 03.04.2021 |
| Semi-finals | Hassan B./Schmitz C. | Madaras N./Vanta V. | 2:1 (4:6, 6:4, 10:6) | details | 03.04.2021 |
| Quarter-finals | Fayziev S./Kalovelonis M. | Hassan B./Schmitz C. | 0:2 (1:6, 1:6) | details | 01.04.2021 |
| 1/8-finals | Ayar G./Karabulut F. | Hassan B./Schmitz C. | 0:2 (1:6, 2:6) | details | 31.03.2021 |
| Turkey: M15 Antalya 12 - Doubles - Main |
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| Semi-finals | Schmitz C./Woerner P. | Dancu V. A./Donev G. | 0:2 (4:6, 4:6) | details | 27.03.2021 |
| Quarter-finals | Dhoe B./Vernier M. | Schmitz C./Woerner P. | 0:2 (0:6, 1:6) | details | 26.03.2021 |
| 1/8-finals | Bertuccioli F./Den Heijer G. | Schmitz C./Woerner P. | 1:2 (5:7, 6:4, 6:10) | details | 24.03.2021 |
 Tunisia: M15 Monastir 8 - Doubles - Main |
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| Semi-finals | Melnic V./Sinclair C. | Schmitz C./Wehnelt K. | 2:1 (4:6, 6:3, 10:8) | details | 12.03.2021 |
| Quarter-finals | Kalovelonis M./Thanos A. | Schmitz C./Wehnelt K. | 0:2 (5:7, 4:6) | details | 11.03.2021 |
| 1/8-finals | Corino M./Reitano S. | Schmitz C./Wehnelt K. | 0:2 (4:6, 5:7) | details | 10.03.2021 |