 Ukraine: W15 Chornomorsk - Doubles - Main |
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| 1/8-finals | Kulikova Y./Turkmen D. | Ignatjeva M./Kostenko L. | CAN. | details | 24.08.2021 |
| Ukraine: W25 Kyiv - Doubles - Main |
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| Semi-finals | Jang S. J./Marinkovic B. | Kostenko L./Sobolieva A. | WO. | details | 23.07.2021 |
| Quarter-finals | Nikitash M./Pinaieva A. | Kostenko L./Sobolieva A. | 0:2 (1:6, 0:6) | details | 22.07.2021 |
| 1/8-finals | Kostenko L./Sobolieva A. | Cabaj Awad J./Monnet C. | 2:1 (2:6, 7:64, 10:8) | details | 20.07.2021 |
 Turkey: W15 Antalya 26 - Doubles - Main |
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| Semi-finals | Belgraver J./Toth A. K. | Falkner Z./Kostenko L. | 2:0 (6:4, 7:5) | details | 02.07.2021 |
| Quarter-finals | Falkner Z./Kostenko L. | Mikhaylova V./Pospelova A. | 2:1 (6:3, 4:6, 11:9) | details | 01.07.2021 |
| 1/8-finals | Sandberg V./Wildgruber A. | Falkner Z./Kostenko L. | 0:2 (1:6, 2:6) | details | 30.06.2021 |
| Turkey: W15 Antalya 23 - Doubles - Main |
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| 1/8-finals | Guener M. A./Kostenko L. | Brunskog L./Yoruk I. | 1:2 (6:4, 5:7, 2:10) | details | 08.06.2021 |
| Turkey: W15 Antalya 22 - Doubles - Main |
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| Final | Bilardo F./Kostenko L. | Bejlek S./Turkmen D. | 1:2 (6:4, 1:6, 7:10) | details | 05.06.2021 |
| Semi-finals | Herazo Gonzalez M./Siedliska N. | Bilardo F./Kostenko L. | 0:2 (4:6, 5:7) | details | 04.06.2021 |
| Quarter-finals | Dolzhenko M./Zaparyniuk A. | Bilardo F./Kostenko L. | 0:2 (3:6, 1:6) | details | 03.06.2021 |
| 1/8-finals | Bilardo F./Kostenko L. | Demidova D./Demidova L. | 2:0 (6:2, 6:2) | details | 01.06.2021 |
 Egypt: W15 Sharm El Sheikh 10 - Doubles - Main |
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| 1/8-finals | Kostenko L./Nesmianovych A. | Cadar E.-T./Gadecki O. | 0:2 (3:6, 1:6) | details | 06.04.2021 |
 Kazakhstan: W15 Shymkent 2 - Doubles - Main |
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| 1/8-finals | Kazionova E./Sharipova S. | Bergen M./Kostenko L. | 2:0 (6:1, 6:4) | details | 09.02.2021 |
| Kazakhstan: W15 Shymkent - Doubles - Main |
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| 1/8-finals | Ainitdinova G./Kulambayeva Z. | Bergen M./Kostenko L. | 2:0 (6:2, 6:2) | details | 02.02.2021 |
 Estonia: W15 Haabneeme - Doubles - Main |
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| 1/8-finals | Bartone K./Kostenko L. | Appleton E./Kubka M. | 0:2 (4:6, 3:6) | details | 18.11.2020 |
 Bulgaria: W15 Varna - Doubles - Main |
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| 1/8-finals | Garland J./Kostenko L. | Augustinova N./Breckova N. | 0:2 (65:7, 4:6) | details | 09.09.2020 |
 Australia: Australian Open - Doubles - Main |
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| 1/16-finals | Eala A./Nugroho P. M. | Avanesyan E./Kostenko L. | 2:1 (7:5, 4:6, 10:8) | details | 27.01.2020 |
 USA: US Open - Doubles - Main |
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| 1/16-finals | Noel A./Parry D. | Kostenko L./Owensby C. | CAN. | details | 03.09.2019 |
 United Kingdom: Wimbledon - Doubles - Main |
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| 1/16-finals | Kostenko L./Nahimana S. | Broadus S./Forbes A. | 0:2 (1:6, 4:6) | details | 09.07.2019 |
 France: French Open - Doubles - Main |
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| 1/8-finals | Charaeva A./Tikhonova A. | Kostenko L./Morlet G. | 2:0 (6:2, 6:4) | details | 06.06.2019 |
| 1/16-finals | Kostenko L./Morlet G. | Fayard J./Nguyen Tan L. | 2:0 (6:2, 7:5) | details | 04.06.2019 |
