World: Olympic Games - Doubles - Main |
| 1/16-finals | Begu I./Niculescu M. | Hsieh S-W./Tsao C. Y. | 0:2 (62:7, 5:7) | details | 28.07.2024 |
USA: Miami - Doubles - Main |
| 1/16-finals | Begu I./Niculescu M. | Rosolska A./Routliffe E. | 0:2 (63:7, 64:7) | details | 25.03.2022 |
USA: Indian Wells - Doubles - Main |
| Quarter-finals | Begu I./Niculescu M. | Dabrowski G./Olmos G. | 1:2 (2:6, 6:2, 7:10) | details | 15.03.2022 |
| 1/8-finals | Hozumi E./Ninomiya M. | Begu I./Niculescu M. | 0:2 (4:6, 5:7) | details | 14.03.2022 |
| 1/16-finals | Yastremska D./Yastremska I. | Begu I./Niculescu M. | 0:2 (1:6, 1:6) | details | 12.03.2022 |
United Kingdom: Wimbledon - Doubles - Main |
| 1/8-finals | Hsieh S-W./Strycova B. | Begu I./Niculescu M. | 2:0 (6:3, 6:4) | details | 09.07.2019 |
| 1/16-finals | Han X.Y./Kalashnikova O. | Begu I./Niculescu M. | 1:2 (3:6, 6:3, 0:6) | details | 06.07.2019 |
| 1/32-finals | Kasatkina D./Kontaveit A. | Begu I./Niculescu M. | 1:2 (6:3, 4:6, 2:6) | details | 04.07.2019 |
World: Fed Cup - World Group - Doubles - Main |
| | Garcia C./Mladenovic K. | Begu I./Niculescu M. | CAN. | details | 21.04.2019 |
| | Krejcikova B./Siniakova K. | Begu I./Niculescu M. | 1:2 (7:62, 4:6, 4:6) | details | 10.02.2019 |
Thailand: Hua Hin - Doubles - Main |
| Final | Blinkova A./Wang Y. | Begu I./Niculescu M. | 1:2 (6:2, 1:6, 10:12) | details | 03.02.2019 |
| Semi-finals | Han X.Y./Jurak Schreiber D. | Begu I./Niculescu M. | 0:2 (64:7, 2:6) | details | 02.02.2019 |
| Quarter-finals | Nara K./Zheng S. | Begu I./Niculescu M. | 0:2 (2:6, 5:7) | details | 30.01.2019 |
| 1/8-finals | Jiang X./Tang Q. | Begu I./Niculescu M. | 0:2 (5:7, 3:6) | details | 29.01.2019 |
USA: US Open - Doubles - Main |
| 1/16-finals | Kichenok L./Siegemund L. | Begu I./Niculescu M. | 2:1 (3:6, 6:3, 6:2) | details | 31.08.2018 |
| 1/32-finals | Dzalamidze N./Ostapenko J. | Begu I./Niculescu M. | 0:2 (3:6, 65:7) | details | 31.08.2018 |
USA: New Haven - Doubles - Main |
| 1/8-finals | Kichenok N./Rodionova An. | Begu I./Niculescu M. | 2:1 (2:6, 7:64, 10:8) | details | 21.08.2018 |
USA: Cincinnati - Doubles - Main |
| 1/16-finals | Christian K./Santamaria S. | Begu I./Niculescu M. | 2:0 (7:5, 7:5) | details | 14.08.2018 |
| 1/16-finals | Barty A./Vandeweghe C. | Begu I./Niculescu M. | CAN. | details | 14.08.2018 |
Qatar: Doha - Doubles - Main |
| 1/16-finals | Begu I./Niculescu M. | Krejcikova B./Siniakova K. | CAN. | details | 13.02.2018 |
Australia: Australian Open - Doubles - Main |
| Semi-finals | Begu I./Niculescu M. | Makarova E./Vesnina E. | 0:2 (4:6, 3:6) | details | 24.01.2018 |
| Quarter-finals | Begu I./Niculescu M. | Brady J./King V. | 2:1 (4:6, 6:2, 6:0) | details | 23.01.2018 |
| 1/8-finals | Kichenok N./Rodionova An. | Begu I./Niculescu M. | 0:0 RET. (1:4) | details | 21.01.2018 |
| 1/16-finals | Moore J./Perez E. | Begu I./Niculescu M. | 1:2 (6:3, 3:6, 5:7) | details | 19.01.2018 |
| 1/32-finals | Lucic-Baroni M./Petkovic A. | Begu I./Niculescu M. | 1:2 (7:66, 3:6, 2:6) | details | 17.01.2018 |
Russia: St. Petersburg - Doubles - Main |
| Quarter-finals | Begu I./Niculescu M. | Saville D./Mladenovic K. | 0:2 (3:6, 2:6) | details | 02.02.2017 |
| 1/8-finals | Begu I./Niculescu M. | Kuncikova L./Mertens E. | 2:0 (6:1, 6:3) | details | 01.02.2017 |
World: Olympic Games - Doubles - Main |
| 1/16-finals | Begu I./Niculescu M. | Chan H-C./Chan L. | 1:2 (7:5, 4:6, 3:6) | details | 08.08.2016 |
France: French Open - Doubles - Main |
| 1/32-finals | Begu I./Niculescu M. | Diatchenko V./Voskoboeva G. | CAN. | details | 26.05.2016 |
Italy: Rome - Doubles - Main |
| Semi-finals | Hingis M./Mirza S. | Begu I./Niculescu M. | 2:0 (6:3, 6:4) | details | 14.05.2016 |
| Quarter-finals | Babos T./Shvedova Y. | Begu I./Niculescu M. | 0:2 (64:7, 3:6) | details | 13.05.2016 |
| 1/8-finals | Begu I./Niculescu M. | Chan L./Groenefeld A. | 2:1 (2:6, 7:61, 10:8) | details | 12.05.2016 |
| 1/16-finals | Kuznetsova S./Pavlyuchenkova A. | Begu I./Niculescu M. | 1:2 (6:4, 3:6, 7:10) | details | 10.05.2016 |
Spain: Madrid - Doubles - Main |
| 1/16-finals | Begu I./Niculescu M. | Chuang C.-J./Jurak Schreiber D. | 1:2 (6:2, 4:6, 8:10) | details | 30.04.2016 |
Russia: Moscow - Doubles - Main |
| Final | Kasatkina D./Vesnina E. | Begu I./Niculescu M. | 2:1 (6:3, 67:7, 10:5) | details | 23.10.2015 |
| Semi-finals | Klepac A./Siniakova K. | Begu I./Niculescu M. | 0:2 (4:6, 0:6) | details | 22.10.2015 |
| Quarter-finals | Dushevina V./Rodionova An. | Begu I./Niculescu M. | 0:2 (0:6, 2:6) | details | 21.10.2015 |
| 1/8-finals | Cornet A./Saville D. | Begu I./Niculescu M. | 0:2 (3:6, 62:7) | details | 20.10.2015 |
China: Beijing - Doubles - Main |
| 1/16-finals | Sestini Hlavackova A./Hradecka L. | Begu I./Niculescu M. | 2:1 (6:2, 3:6, 11:9) | details | 05.10.2015 |
China: Wuhan - Doubles - Main |
| Final | Hingis M./Mirza S. | Begu I./Niculescu M. | 2:0 (6:2, 6:3) | details | 03.10.2015 |
| Semi-finals | Begu I./Niculescu M. | Sestini Hlavackova A./Hradecka L. | 2:1 (6:4, 1:6, 10:8) | details | 02.10.2015 |
| Quarter-finals | Muguruza G./Suarez Navarro C. | Begu I./Niculescu M. | WO. | details | 01.10.2015 |
| 1/8-finals | Begu I./Niculescu M. | Garcia C./Srebotnik K. | 2:0 (6:2, 6:2) | details | 30.09.2015 |
| 1/16-finals | Begu I./Niculescu M. | Xu Y./Zheng S. | 2:1 (5:7, 7:63, 10:8) | details | 29.09.2015 |
Italy: Rome - Doubles - Main |
| 1/8-finals | Hingis M./Mirza S. | Begu I./Niculescu M. | 2:0 (6:4, 6:1) | details | 12.05.2015 |
World: Fed Cup - World Group II - Doubles - Play Offs |
| | Begu I./Niculescu M. | Muguruza G./Medina Garrigues A. | 2:1 (5:7, 6:3, 6:2) | details | 08.02.2015 |
World: Fed Cup - World Group II - Doubles - Play Offs |
| | Begu I./Niculescu M. | Jovic J./Stojanovic N. | 0:0 RET. (1:0) | details | 20.04.2014 |