 Romania: Cluj-Napoca - Doubles - Main |
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| 1/8-finals | Arruabarrena L./Mitu A. | Fomina A./Yashina E. | 0:2 (4:6, 4:6) | details | 04.08.2021 |
 Italy: Palermo - Doubles - Main |
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| 1/8-finals | Arruabarrena L./Gumulya B. | Mitu A./Van der Hoek R. | 1:2 (6:4, 4:6, 7:10) | details | 20.07.2021 |
 Sweden: Bastad - Doubles - Main |
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| Quarter-finals | Arruabarrena L./Bolsova Zadoinov A. | Peterson R./Sherif M. | WO. | details | 08.07.2021 |
| 1/8-finals | Arruabarrena L./Bolsova Zadoinov A. | Gatto-Monticone G./Parrizas-Diaz N. | 2:0 (7:5, 6:4) | details | 05.07.2021 |
 United Kingdom: Wimbledon - Doubles - Main |
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| 1/32-finals | Santamaria S./Zidansek T. | Arruabarrena L./Podoroska N. | 2:0 (6:3, 6:2) | details | 01.07.2021 |
 Croatia: Bol - Doubles - Main |
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| Semi-finals | Bolsova Zadoinov A./Kawa K. | Arruabarrena L./Errani S. | 2:1 (6:4, 63:7, 10:8) | details | 11.06.2021 |
| Quarter-finals | Amanmuradova A./Dulgheru A. | Arruabarrena L./Errani S. | 1:2 (2:6, 6:4, 7:10) | details | 10.06.2021 |
| 1/8-finals | Arruabarrena L./Errani S. | Kato M./Voracova R. | 2:0 (6:2, 6:2) | details | 08.06.2021 |
 France: French Open - Doubles - Main |
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| 1/16-finals | Fichman S./Olmos G. | Arruabarrena L./Dolehide C. | 2:0 (6:4, 6:1) | details | 04.06.2021 |
| 1/32-finals | Buzarnescu M./Tig P. M. | Arruabarrena L./Dolehide C. | 0:2 (4:6, 2:6) | details | 03.06.2021 |
 Turkey: Istanbul - Doubles - Main |
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| 1/8-finals | Kania-Chodun P./Lohoff J. | Arruabarrena L./Voracova R. | 2:0 (6:2, 6:2) | details | 21.04.2021 |
 Colombia: Bogota - Doubles - Main |
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| Quarter-finals | Arruabarrena L./Piter K. | Rodionova Ar./Van der Hoek R. | 1:2 (6:4, 2:6, 7:10) | details | 08.04.2021 |
| 1/8-finals | Ahn K./Arconada U. M. | Arruabarrena L./Piter K. | 1:2 (4:6, 6:2, 2:10) | details | 05.04.2021 |
 Mexico: Monterrey - Doubles - Main |
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| Semi-finals | Arruabarrena L./Perez E. | Dolehide C./Muhammad A. | 1:2 (1:6, 6:3, 10:12) | details | 19.03.2021 |
| Quarter-finals | Kania-Chodun P./Piter K. | Arruabarrena L./Perez E. | 0:2 (64:7, 4:6) | details | 18.03.2021 |
| 1/8-finals | Osorio C./Zarazua R. | Arruabarrena L./Perez E. | 1:2 (2:6, 6:3, 5:10) | details | 17.03.2021 |
| Mexico: Guadalajara 2 - Doubles - Main |
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| 1/8-finals | Arruabarrena L./Piter K. | Podoroska N./Sorribes Tormo S. | 1:2 (7:5, 4:6, 8:10) | details | 08.03.2021 |
 Australia: Australian Open - Doubles - Main |
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| 1/32-finals | Dabrowski G./Mattek-Sands B. | Arruabarrena L./Christian K. | 2:0 (6:2, 6:3) | details | 10.02.2021 |
| Australia: Melbourne (Gippsland Trophy) - Doubles - Main |
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| 1/8-finals | Arruabarrena L./Christian K. | Siegemund L./Zvonareva V. | 0:2 (65:7, 2:6) | details | 02.02.2021 |
Luxembourg: Luxembourg - Singles - Qualification
USA: US Open - Singles - Qualification
Germany: W60 Versmold - Singles - Main
Hungary: Budapest - Singles - Qualification