| ITF W75 Chiasso | 04/18 12:40 | 26 | [86] Kayla Day v Susan Bandecchi [376] | 7-6,5-7,7-5 | |
| ITF W75 Chiasso | 04/17 07:55 | 25 | [86] Kayla Day v Anna Gabric [425] | 6-4,1-6,6-1 | |
| ITF W75 Bellinzona | 04/13 11:30 | 28 | [86] Kayla Day v Anna Bondar [114] | 2-6,5-7 | |
| ITF W75 Bellinzona | 04/12 12:00 | 27 | [86] Kayla Day v Lesley Pattinama Kerkhove [300] | 6-0,6-7,6-3 | |
| ITF W75 Bellinzona | 04/11 15:30 | 26 | [86] Kayla Day v Jenny Duerst [250] | 1-6,7-5,6-3 | |
| ITF W75 Bellinzona | 04/10 12:15 | 25 | Kayla Day v Katerina Tsygourova | 6-2,6-2 | |
| WTA Charleston | 04/02 16:40 | 24 | [47] Caroline Dolehide v Kayla Day [84] | 6-3,0-6,6-4 | |
| WTA Miami | 03/17 17:20 | 14 | [88] Kayla Day v Emiliana Arango [121] | 5-7,7-5,4-6 | |
| WTA Charleston | 03/11 17:25 | 25 | [88] Kayla Day v Aliaksandra Sasnovich [97] | 7-5,5-7,4-6 | |
| WTA Indian Wells | 03/09 04:15 | 24 | [88] Kayla Day v Nadia Podoroska [84] | 6-7,4-6 | |
| WTA Indian Wells | 03/05 23:10 | 15 | [88] Kayla Day v Erika Andreeva [98] | 1-6,6-3,3-6 | |
| WTA Indian Wells | 03/03 23:05 | 14 | [89] Kayla Day v Alycia Parks [117] | 6-1,6-4 | |
| WTA San Diego | 02/25 19:00 | 19 | [89] Kayla Day v Ann Li [166] | 3-6,0-6 | |
| WTA San Diego | 02/24 19:25 | 14 | [89] Kayla Day v Madison Sieg [332] | 6-3,6-3 | |
| WTA Mumbai | 02/05 12:20 | 25 | [92] Kayla Day v Sahaja Yamalapalli [336] | 4-6,6-1,4-6 | |
| Australian Open Women | 01/15 00:00 | 23 | [86] Kayla Day v Viktoriya Tomova [70] | 4-6,2-6 | |
| WTA Hobart | 01/06 00:00 | 14 | [89] Kayla Day v Viktoriya Tomova [75] | 6-3,0-6,3-6 | |
| WTA Auckland | 01/02 05:15 | 25 | [77] Yue Yuan v Kayla Day [89] | 7-6,6-7,6-1 | |
| ITF W80 Tyler | 10/29 18:00 | 29 | [42] Emma Navarro v Kayla Day [94] | 6-3,6-4 | |
| ITF W80 Tyler | 10/28 17:45 | 28 | Ayana Akli v Kayla Day | 2-6,5-7 | |
| ITF W80 Tyler | 10/27 19:20 | 27 | [171] Maria Kozyreva v Kayla Day [94] | 4-6,4-6 | |
| ITF W80 Tyler | 10/27 02:40 | 26 | Amelia Rajecki v Kayla Day | 1-6,4-6 | |
| ITF W80 Tyler | 10/25 18:30 | 25 | [415] Alexandra Vecic v Kayla Day [94] | 7-6,2-6,2-6 | |
| 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 |
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. 86 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.