| WTA Indian Wells | 03/08 19:00 | 23 | Monica Niculescu v Sorana Cirstea | 2-6,3-6 | |
| Tie Break Tens Women | 03/06 01:48 | - | Sorana Cirstea v Shuai Zhang | 6-1,1-6,0-0 | |
| WTA Budapest | 02/20 12:35 | 25 | Viktoria Kuzmova v Sorana Cirstea | 6-4,6-2 | |
| WTA Doha | 02/15 11:00 | 26 | Sorana Cirstea v Garbine Muguruza | 0-6,4-6 | |
| WTA Doha | 02/14 14:00 | 25 | Elise Mertens v Sorana Cirstea | 5-7,4-6 | |
| WTA Doha | 02/13 13:55 | 24 | Maria Sakkari v Sorana Cirstea | 2-6,3-6 | |
| 2018 Fed Cup | 02/11 11:45 | 27 | Sorana Cirstea v Bianca Andreescu | Cancelled | |
| 2018 Fed Cup | 02/10 11:00 | 27 | Sorana Cirstea v Carol Zhao | 6-2,6-2 | |
| WTA St. Petersburg | 01/30 17:35 | 25 | Sorana Cirstea v Dominika Cibulkova | 5-7,2-6 | |
| Australian Open - Damer | 01/18 03:00 | 24 | Lucie Safarova v Sorana Cirstea | 6-2,6-4 | |
| Australian Open - Damer | 01/16 02:10 | 23 | Sorana Cirstea v Zarina Diyas | 5-7,6-4,6-3 | |
| WTA Hobart | 01/08 03:35 | 25 | Heather Watson v Sorana Cirstea | 7-5,6-3 | |
| WTA Brisbane | 01/02 04:50 | 26 | Sorana Cirstea v Anastasija Sevastova | 2-6,1-6 | |
| WTA Brisbane | 01/01 02:25 | 25 | Jennifer Brady v Sorana Cirstea | 6-7,1-6 | |
| WTA Luxembourg | 10/16 13:30 | 25 | Veronica Cepede Royg v Sorana Cirstea | Retired | |
| WTA Linz | 10/13 18:00 | 27 | [28] Magdalena Rybarikova v Sorana Cirstea [37] | 5-7,6-2,6-1 | |
| WTA Linz | 10/12 18:30 | 26 | Natalia Vikhlyantseva v Sorana Cirstea | 6-7,4-6 | |
| WTA Linz | 10/11 10:00 | 25 | [85] Alison Van Uytvanck v Sorana Cirstea [37] | 3-6,5-7 | |
| WTA Beijing | 10/06 07:20 | 27 | [8] Jelena Ostapenko v Sorana Cirstea [44] | 6-4,6-4 | |
| WTA Beijing | 10/05 04:30 | 26 | [44] Sorana Cirstea v Karolina Pliskova [4] | 6-1,7-5 | |
| WTA Beijing | 10/03 09:15 | 25 | [71] Christina McHale v Sorana Cirstea [44] | 6-7,0-6 | |
| WTA Beijing | 09/30 08:20 | 24 | [49] Mona Barthel v Sorana Cirstea [46] | 6-7,1-6 | |
| WTA Wuhan | 09/26 07:40 | 25 | [46] Sorana Cirstea v Qiang Wang [55] | 3-6,3-6 | |
| WTA Wuhan | 09/24 13:15 | 24 | [147] Yafan Wang v Sorana Cirstea [52] | 3-6,3-6 | |
| WTA Seoul | 09/22 02:00 | 27 | [52] Sorana Cirstea v Luksika Kumkhum [155] | 3-6,1-6 | |
| WTA Seoul | 09/21 05:55 | 26 | [52] Sorana Cirstea v Nicole Gibbs [121] | 6-3,6-3 | |
| WTA Seoul | 09/18 04:55 | 25 | [51] Sorana Cirstea v Misa Eguchi [494] | 6-1,6-3 | |
| US Open - Damer | 08/31 15:00 | 24 | [12] Jelena Ostapenko v Sorana Cirstea [54] | 6-4,6-4 | |
| US Open - Damer | 08/29 15:00 | 23 | [171] Lesley Kerkhove v Sorana Cirstea [54] | 1-6,3-6 | |
| WTA Cincinnati Qual | 08/12 19:55 | 44 | [54] Sorana Cirstea v Aleksandra Krunic [84] | 7-6,3-6,4-6 |