| ITF W80 Macon | 10/21 17:15 | 28 | [123] Panna Udvardy v Kayla Day [95] | 6-4,3-6,6-3 | |
| ITF W80 Macon | 10/20 19:45 | 27 | Alexa Noel v Kayla Day | 7-6,3-6,5-7 | |
| ITF W80 Macon | 10/19 14:00 | 26 | [205] Tatiana Prozorova v Kayla Day [95] | 4-6,1-6 | |
| ITF W80 Macon | 10/18 13:55 | 25 | [337] Sophie Chang v Kayla Day [95] | 4-6,1-6 | |
| WTA Seoul | 10/10 08:00 | 25 | [86] Kayla Day v Marie Bouzkova [29] | 4-6,4-6 | |
| WTA Beijing | 09/29 06:35 | 14 | [96] Kayla Day v Cristina Bucsa [79] | 6-2,2-6,1-6 | |
| WTA Tokyo | 09/27 04:55 | 26 | [96] Kayla Day v Veronika Kudermetova [19] | 3-6,3-6 | |
| WTA Tokyo | 09/25 03:30 | 25 | [96] Kayla Day v Moyuka Uchijima [160] | 6-2,6-2 | |
| WTA San Diego | 09/10 19:30 | 19 | [68] Camila Osorio v Kayla Day [93] | 5-7,6-4,6-3 | |
| WTA San Diego | 09/09 20:45 | 14 | [379] Maria F Herazo Gonzalez v Kayla Day [93] | 1-6,3-6 | |
| US Open Women | 08/28 23:25 | 23 | [93] Kayla Day v Sorana Cirstea [30] | 2-6,3-6 | |
| WTA Stanford | 08/16 22:30 | 26 | [96] Kayla Day v Jodie Burrage [101] | 6-2,6-7,3-6 | |
| WTA Stanford | 08/15 03:15 | 25 | [242] Carol Zhao v Kayla Day [96] | 2-6,4-6 | |
| WTA Montreal | 08/07 15:00 | 24 | [97] Kayla Day v Marie Bouzkova [39] | 6-7,3-6 | |
| WTA Montreal | 08/06 16:40 | 19 | [216] Sachia Vickery v Kayla Day [97] | 2-6,6-1,3-6 | |
| WTA Montreal | 08/05 18:35 | 14 | [202] Louisa Chirico v Kayla Day [97] | 2-6,2-6 | |
| WTA Washington | 07/29 14:00 | 14 | [94] Kayla Day v Magdalena Frech [79] | Retired | |
| ITF W100 Granby | 07/23 17:00 | 29 | [160] Katherine Sebov v Kayla Day [125] | 4-6,6-2,5-7 | |
| ITF W100 Granby | 07/22 19:30 | 28 | [125] Kayla Day v Ashlyn Krueger [116] | 6-3,4-6,6-1 | |
| ITF W100 Granby | 07/21 15:00 | 27 | [405] Cadence Brace v Kayla Day [125] | 2-6,4-6 | |
| ITF W100 Granby | 07/20 15:55 | 26 | [335] Bianca Jolie Fernandez v Kayla Day [125] | 3-6,3-6 | |
| ITF W100 Granby | 07/17 21:05 | 25 | [238] Renata Zarazua v Kayla Day [125] | 4-6,4-6 | |
| ITF W60 Saskatoon | 07/13 16:00 | 26 | [379] Grace Min v Kayla Day [120] | 6-3,7-6 | |
| ITF W60 Saskatoon | 07/11 19:10 | 25 | [273] Kyoka Okamura v Kayla Day [120] | 4-6,4-6 | |
| Wimbledon Women | 06/28 13:45 | 15 | [119] Kayla Day v Su-Wei Hsieh [29] | 2-6,3-6 | |
| Wimbledon Women | 06/27 10:00 | 14 | [119] Kayla Day v Lesley Pattinama Kerkhove [202] | 7-5,2-6,7-6 | |
| French Open Women | 06/03 14:15 | 25 | [100] Anna Karolina Schmiedlova v Kayla Day [138] | 6-1,6-3 | |
| French Open Women | 06/01 09:00 | 24 | [138] Kayla Day v Madison Keys [20] | 6-2,4-6,6-4 | |
| French Open Women | 05/29 09:00 | 23 | [138] Kayla Day v Kristina Mladenovic [166] | 7-5,6-1 | |
| French Open Women | 05/25 09:00 | 19 | [134] Elina Avanesyan v Kayla Day [138] | 7-5,4-6,6-7 |
Wikipedia - Kayla Day
Kayla Day (born September 28, 1999) is an American professional tennis player. She has a career-high singles ranking of world No. 84 by the WTA. As a junior, she won one junior Grand Slam title, at the 2016 US Open. There, she finished runner-up in the doubles event, partnering with Caroline Dolehide.
Despite having success as junior, Day has mostly spent time playing on the ITF Women's Circuit instead of WTA Tour, due to her ranking. She officially turned professional in 2017, at the Australian Open.