| WTA Houston | 11/11 16:00 | 24 | Catherine Bellis v Ellen Perez | 6-3,6-2 | |
| WTA Houston | 11/10 17:00 | 28 | Alexa Glatch v Catherine Bellis | 4-6,3-6 | |
| WTA Róma | 05/14 09:00 | - | Daria Gavrilova v Catherine Bellis | Cancelled | |
| WTA Miami | 03/21 19:10 | 23 | [44] Catherine Bellis v Victoria Azarenka [186] | 3-6,0-6 | |
| WTA Indian Wells | 03/10 22:30 | 24 | Elena Vesnina v Catherine Bellis | 2-6,6-1,6-1 | |
| WTA Indian Wells | 03/08 21:40 | 23 | Sara Sorribes Tormo v Catherine Bellis | 0-6,3-6 | |
| WTA Dubai | 02/21 20:05 | 26 | Catherine Bellis v Garbine Muguruza | 3-6,5-7 | |
| WTA Dubai | 02/20 10:00 | 25 | Catherine Bellis v Elise Mertens | 6-3,6-3 | |
| WTA Doha | 02/16 14:40 | 27 | Catherine Bellis v Simona Halep | 0-6,4-6 | |
| WTA Doha | 02/15 12:25 | 26 | Karolina Pliskova v Catherine Bellis | 6-7,3-6 | |
| WTA Doha | 02/14 12:30 | 25 | Catherine Bellis v Madison Keys | 2-6,6-3,6-0 | |
| WTA Doha | 02/12 11:15 | 24 | Catherine Bellis v Daria Kasatkina | Retired | |
| WTA Doha Qual | 02/11 12:30 | 46 | Catherine Bellis v Sofya Zhuk | 6-1,6-3 | |
| WTA Doha Qual | 02/10 09:15 | 45 | Catherine Bellis v Mubaraka Al-Naimi | 6-0,6-0 | |
| Ausztrál Open - nők | 01/15 01:30 | 23 | Kiki Bertens v Catherine Bellis | 6-7,6-4,6-2 | |
| WTA Sydney | 01/10 02:00 | 26 | Catherine Bellis v Agnieszka Radwanska | 6-7,0-6 | |
| WTA Sydney | 01/08 09:35 | 25 | Catherine Bellis v Magdalena Rybarikova | 7-6,6-0 | |
| WTA Sydney Qual | 01/06 23:00 | 54 | Ekaterina Alexandrova v Catherine Bellis | 6-3,3-6,1-6 | |
| WTA Sydney Qual | 01/05 23:00 | 46 | Kristina Kucova v Catherine Bellis | 5-7,2-6 | |
| WTA Sydney Qual | 01/04 23:00 | 45 | Jennifer Brady v Catherine Bellis | 6-7,5-7 | |
| WTA Brisbane | 01/03 10:50 | 26 | Catherine Bellis v Karolina Pliskova | 1-6,1-6 | |
| WTA Brisbane | 01/01 04:20 | 25 | Kateryna Bondarenko v Catherine Bellis | 2-6,5-7 | |
| WTA Wuhan | 09/24 04:30 | 24 | [41] Catherine Bellis v Ashleigh Barty [37] | 5-7,0-6 | |
| WTA Tokyo | 09/19 02:00 | 25 | [23] Anastasia Pavlyuchenkova v Catherine Bellis [41] | 4-6,6-0,6-4 | |
| US Open - nők | 08/30 17:25 | 23 | [80] Nao Hibino v Catherine Bellis [36] | 6-3,4-6,7-5 | |
| WTA Cincinnati | 08/15 17:00 | 24 | [45] Alize Cornet v Catherine Bellis [35] | 7-6,3-6,6-2 | |
| WTA Toronto | 08/10 15:00 | 26 | [36] Catherine Bellis v Caroline Garcia [21] | 4-6,2-6 | |
| WTA Toronto | 08/09 15:00 | 25 | [8] Svetlana Kuznetsova v Catherine Bellis [36] | 4-6,5-7 | |
| WTA Toronto | 08/08 15:00 | 24 | [35] Julia Goerges v Catherine Bellis [36] | 6-4,3-6,2-6 | |
| WTA Stanford | 08/05 21:00 | 28 | [24] Coco Vandeweghe v Catherine Bellis [44] | 6-3,6-1 |