| WTA Canberra | 01/01 05:55 | 25 | [114] Elizabeth Mandlik v Katie Volynets [108] | 2-6,0-6 | |
| WTA Midland | 11/01 00:10 | 25 | [108] Katie Volynets v Tatiana Prozorova [201] | 6-4,4-6,2-6 | |
| WTA Tampico | 10/27 20:00 | 27 | [108] Katie Volynets v Anna Kalinskaya [115] | 3-6,1-6 | |
| WTA Tampico | 10/27 00:45 | 26 | [108] Katie Volynets v Hailey Baptiste [136] | 6-7,6-3,6-1 | |
| WTA Tampico | 10/24 21:00 | 25 | [108] Katie Volynets v Ana Sofia Sanchez [393] | 6-1,6-2 | |
| ITF W80 Macon | 10/21 15:00 | 28 | [80] Taylor Townsend v Katie Volynets [109] | 6-3,7-6 | |
| ITF W80 Macon | 10/20 16:00 | 27 | [109] Katie Volynets v Renata Zarazua [162] | 6-2,6-2 | |
| ITF W80 Macon | 10/19 16:05 | 26 | [109] Katie Volynets v Maria Mateas [323] | 6-3,6-2 | |
| ITF W80 Macon | 10/17 23:00 | 25 | [109] Katie Volynets v Anna Rogers [190] | 7-6,6-3 | |
| ITF W80 Macon | 10/17 23:00 | 25 | Katie Volynets v Allie Kiick | Cancelled | |
| ITF W60 Templeton | 09/29 21:10 | 27 | [182] Renata Zarazua v Katie Volynets [109] | 6-4,4-6,6-0 | |
| ITF W60 Templeton | 09/28 17:55 | 26 | [291] Sophie Chang v Katie Volynets [109] | 4-6,3-6 | |
| ITF W60 Templeton | 09/27 18:45 | 25 | [370] Alexandra Bozovic v Katie Volynets [109] | 6-3,2-6,4-6 | |
| ITF W60 Berkeley | 09/20 16:55 | 25 | Allie Kiick v Katie Volynets | 6-2,6-3 | |
| WTA San Diego | 09/13 18:30 | 26 | [117] Katie Volynets v Sofia Kenin [93] | 6-1,4-6,2-6 | |
| WTA San Diego | 09/11 23:30 | 25 | [117] Katie Volynets v Clervie Ngounoue [477] | 2-6,6-4,6-2 | |
| US Open Women | 08/28 18:35 | 23 | [124] Katie Volynets v Xinyu Wang [53] | 3-6,4-6 | |
| US Open Women | 08/25 23:05 | 19 | [159] Erika Andreeva v Katie Volynets [127] | 1-6,6-4,2-6 | |
| US Open Women | 08/24 14:00 | 15 | [161] Celine Naef v Katie Volynets [127] | 3-6,4-6 | |
| US Open Women | 08/22 17:45 | 14 | [236] Barbora Palicova v Katie Volynets [127] | 3-6,4-6 | |
| WTA Stanford | 08/14 17:00 | 25 | [113] Yue Yuan v Katie Volynets [127] | 4-6,7-6,6-0 | |
| ITF W60 Lexington | 08/03 23:10 | 26 | [411] McCartney Kessler v Katie Volynets [125] | 6-0,6-3 | |
| ITF W60 Lexington | 08/02 17:05 | 25 | [344] Grace Min v Katie Volynets [125] | 2-6,4-6 | |
| WTA Bastad | 07/12 13:30 | 26 | [125] Katie Volynets v Yulia Putintseva [56] | Retired | |
| WTA Bastad | 07/11 09:00 | 25 | [150] Julia Riera v Katie Volynets [125] | 4-6,5-7 | |
| Wimbledon Women | 07/03 12:10 | 23 | [125] Katie Volynets v Caroline Garcia [5] | 4-6,3-6 | |
| WTA Bad Homburg | 06/25 11:20 | 25 | [121] Katie Volynets v Evgeniya Rodina [328] | 0-6,4-6 | |
| WTA Bad Homburg | 06/24 09:00 | 19 | [87] Kateryna Baindl v Katie Volynets [121] | 6-2,0-6,6-4 | |
| WTA Berlin | 06/17 08:30 | 45 | [106] Katie Volynets v Susan Bandecchi [388] | 3-6,4-6 | |
| WTA Hertogenbosch | 06/13 14:10 | 25 | [106] Katie Volynets v Caty McNally [62] | 2-6,1-6 |